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* KASAN: use-after-free Read in wdm_out_callback
@ 2019-08-19 14:48 syzbot
  2019-09-20 15:41 ` Andrey Konovalov
  0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2019-08-19 14:48 UTC (permalink / raw)
  To: andreyknvl, baijiaju1990, bigeasy, colin.king, gregkh,
	linux-kernel, linux-usb, syzkaller-bugs, yuehaibing

Hello,

syzbot found the following crash on:

HEAD commit:    d0847550 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=136553ba600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
dashboard link: https://syzkaller.appspot.com/bug?extid=9a22af9cbb07280ce9cf
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com

cdc_wdm 1-1:118.0: nonzero urb status received: -71
cdc_wdm 1-1:118.0: wdm_int_callback - 0 bytes
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50  
kernel/locking/lockdep.c:3753
Read of size 8 at addr ffff8881cbdca8e8 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc4+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  print_address_description+0x6a/0x32c mm/kasan/report.c:351
  __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
  kasan_report+0xe/0x12 mm/kasan/common.c:612
  __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
  lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
  wdm_out_callback+0x45/0x170 drivers/usb/class/cdc-wdm.c:148
  __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657
  usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722
  dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965
  call_timer_fn+0x179/0x650 kernel/time/timer.c:1322
  expire_timers kernel/time/timer.c:1366 [inline]
  __run_timers kernel/time/timer.c:1685 [inline]
  __run_timers kernel/time/timer.c:1653 [inline]
  run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698
  __do_softirq+0x221/0x912 kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x178/0x1a0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:537 [inline]
  smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
  </IRQ>
RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581
Code: 90 90 41 56 41 55 65 44 8b 2d 64 ea 93 7a 41 54 55 53 0f 1f 44 00 00  
e8 96 5b d5 fb e9 07 00 00 00 0f 00 2d 7a 8f 54 00 fb f4 <65> 44 8b 2d 40  
ea 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffffff86c07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffffffff86c2b200 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86c2ba44
RBP: fffffbfff0d85640 R08: ffffffff86c2b200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
  cpuidle_idle_call kernel/sched/idle.c:154 [inline]
  do_idle+0x3c2/0x4f0 kernel/sched/idle.c:263
  cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354
  start_kernel+0x838/0x872 init/main.c:785
  secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

Allocated by task 83:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_kmalloc mm/kasan/common.c:487 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
  kmalloc include/linux/slab.h:552 [inline]
  kzalloc include/linux/slab.h:748 [inline]
  wdm_create+0x56/0x1720 drivers/usb/class/cdc-wdm.c:786
  wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
  usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
  bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2165
  usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
  generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
  usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
  bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2165
  usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
  hub_port_connect drivers/usb/core/hub.c:5098 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
  port_event drivers/usb/core/hub.c:5359 [inline]
  hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  worker_thread+0x96/0xe20 kernel/workqueue.c:2415
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 83:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
  slab_free_hook mm/slub.c:1423 [inline]
  slab_free_freelist_hook mm/slub.c:1474 [inline]
  slab_free mm/slub.c:3016 [inline]
  kfree+0xe4/0x2f0 mm/slub.c:3957
  wdm_create+0x542/0x1720 drivers/usb/class/cdc-wdm.c:884
  wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
  usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
  bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2165
  usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
  generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
  usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
  bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2165
  usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
  hub_port_connect drivers/usb/core/hub.c:5098 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
  port_event drivers/usb/core/hub.c:5359 [inline]
  hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  worker_thread+0x96/0xe20 kernel/workqueue.c:2415
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881cbdca880
  which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 104 bytes inside of
  1024-byte region [ffff8881cbdca880, ffff8881cbdcac80)
The buggy address belongs to the page:
page:ffffea00072f7200 refcount:1 mapcount:0 mapping:ffff8881da002280  
index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 ffffea000719ca00 0000000400000004 ffff8881da002280
raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881cbdca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8881cbdca800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881cbdca880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                           ^
  ffff8881cbdca900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8881cbdca980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: KASAN: use-after-free Read in wdm_out_callback
  2019-08-19 14:48 KASAN: use-after-free Read in wdm_out_callback syzbot
@ 2019-09-20 15:41 ` Andrey Konovalov
  2019-09-20 15:41   ` syzbot
  2019-09-20 15:42   ` Andrey Konovalov
  0 siblings, 2 replies; 4+ messages in thread
From: Andrey Konovalov @ 2019-09-20 15:41 UTC (permalink / raw)
  To: syzbot
  Cc: baijiaju1990, bigeasy, Colin Ian King, Greg Kroah-Hartman, LKML,
	USB list, syzkaller-bugs, yuehaibing

On Mon, Aug 19, 2019 at 4:48 PM syzbot
<syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    d0847550 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=136553ba600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
> dashboard link: https://syzkaller.appspot.com/bug?extid=9a22af9cbb07280ce9cf
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com
>
> cdc_wdm 1-1:118.0: nonzero urb status received: -71
> cdc_wdm 1-1:118.0: wdm_int_callback - 0 bytes
> ==================================================================
> BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50
> kernel/locking/lockdep.c:3753
> Read of size 8 at addr ffff8881cbdca8e8 by task swapper/0/0
>
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc4+ #26
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>   <IRQ>
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0xca/0x13e lib/dump_stack.c:113
>   print_address_description+0x6a/0x32c mm/kasan/report.c:351
>   __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
>   kasan_report+0xe/0x12 mm/kasan/common.c:612
>   __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
>   lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
>   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
>   _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
>   wdm_out_callback+0x45/0x170 drivers/usb/class/cdc-wdm.c:148
>   __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657
>   usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722
>   dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965
>   call_timer_fn+0x179/0x650 kernel/time/timer.c:1322
>   expire_timers kernel/time/timer.c:1366 [inline]
>   __run_timers kernel/time/timer.c:1685 [inline]
>   __run_timers kernel/time/timer.c:1653 [inline]
>   run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698
>   __do_softirq+0x221/0x912 kernel/softirq.c:292
>   invoke_softirq kernel/softirq.c:373 [inline]
>   irq_exit+0x178/0x1a0 kernel/softirq.c:413
>   exiting_irq arch/x86/include/asm/apic.h:537 [inline]
>   smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095
>   apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
>   </IRQ>
> RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581
> Code: 90 90 41 56 41 55 65 44 8b 2d 64 ea 93 7a 41 54 55 53 0f 1f 44 00 00
> e8 96 5b d5 fb e9 07 00 00 00 0f 00 2d 7a 8f 54 00 fb f4 <65> 44 8b 2d 40
> ea 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
> RSP: 0018:ffffffff86c07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> RAX: 0000000000000007 RBX: ffffffff86c2b200 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86c2ba44
> RBP: fffffbfff0d85640 R08: ffffffff86c2b200 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>   cpuidle_idle_call kernel/sched/idle.c:154 [inline]
>   do_idle+0x3c2/0x4f0 kernel/sched/idle.c:263
>   cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354
>   start_kernel+0x838/0x872 init/main.c:785
>   secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
>
> Allocated by task 83:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_kmalloc mm/kasan/common.c:487 [inline]
>   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
>   kmalloc include/linux/slab.h:552 [inline]
>   kzalloc include/linux/slab.h:748 [inline]
>   wdm_create+0x56/0x1720 drivers/usb/class/cdc-wdm.c:786
>   wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Freed by task 83:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
>   slab_free_hook mm/slub.c:1423 [inline]
>   slab_free_freelist_hook mm/slub.c:1474 [inline]
>   slab_free mm/slub.c:3016 [inline]
>   kfree+0xe4/0x2f0 mm/slub.c:3957
>   wdm_create+0x542/0x1720 drivers/usb/class/cdc-wdm.c:884
>   wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> The buggy address belongs to the object at ffff8881cbdca880
>   which belongs to the cache kmalloc-1k of size 1024
> The buggy address is located 104 bytes inside of
>   1024-byte region [ffff8881cbdca880, ffff8881cbdcac80)
> The buggy address belongs to the page:
> page:ffffea00072f7200 refcount:1 mapcount:0 mapping:ffff8881da002280
> index:0x0 compound_mapcount: 0
> flags: 0x200000000010200(slab|head)
> raw: 0200000000010200 ffffea000719ca00 0000000400000004 ffff8881da002280
> raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>   ffff8881cbdca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff8881cbdca800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8881cbdca880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                                                            ^
>   ffff8881cbdca900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff8881cbdca980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Most probably the same issue as:

https://syzkaller.appspot.com/bug?id=07a5f1529b95adcb80cbf8729f9cb499b980991d

#syz dup: KASAN: use-after-free Read in wdm_out_callback

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Re: KASAN: use-after-free Read in wdm_out_callback
  2019-09-20 15:41 ` Andrey Konovalov
@ 2019-09-20 15:41   ` syzbot
  2019-09-20 15:42   ` Andrey Konovalov
  1 sibling, 0 replies; 4+ messages in thread
From: syzbot @ 2019-09-20 15:41 UTC (permalink / raw)
  To: Andrey Konovalov
  Cc: andreyknvl, baijiaju1990, bigeasy, colin.king, gregkh,
	linux-kernel, linux-usb, syzkaller-bugs, yuehaibing

> On Mon, Aug 19, 2019 at 4:48 PM syzbot
> <syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com> wrote:

>> Hello,

>> syzbot found the following crash on:

>> HEAD commit:    d0847550 usb-fuzzer: main usb gadget fuzzer driver
>> git tree:       https://github.com/google/kasan.git usb-fuzzer
>> console output: https://syzkaller.appspot.com/x/log.txt?x=136553ba600000
>> kernel config:   
>> https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
>> dashboard link:  
>> https://syzkaller.appspot.com/bug?extid=9a22af9cbb07280ce9cf
>> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

>> Unfortunately, I don't have any reproducer for this crash yet.

>> IMPORTANT: if you fix the bug, please add the following tag to the  
>> commit:
>> Reported-by: syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com

>> cdc_wdm 1-1:118.0: nonzero urb status received: -71
>> cdc_wdm 1-1:118.0: wdm_int_callback - 0 bytes
>> ==================================================================
>> BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50
>> kernel/locking/lockdep.c:3753
>> Read of size 8 at addr ffff8881cbdca8e8 by task swapper/0/0

>> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc4+ #26
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>>    <IRQ>
>>    __dump_stack lib/dump_stack.c:77 [inline]
>>    dump_stack+0xca/0x13e lib/dump_stack.c:113
>>    print_address_description+0x6a/0x32c mm/kasan/report.c:351
>>    __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
>>    kasan_report+0xe/0x12 mm/kasan/common.c:612
>>    __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
>>    lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
>>    __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
>>    _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
>>    wdm_out_callback+0x45/0x170 drivers/usb/class/cdc-wdm.c:148
>>    __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657
>>    usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722
>>    dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965
>>    call_timer_fn+0x179/0x650 kernel/time/timer.c:1322
>>    expire_timers kernel/time/timer.c:1366 [inline]
>>    __run_timers kernel/time/timer.c:1685 [inline]
>>    __run_timers kernel/time/timer.c:1653 [inline]
>>    run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698
>>    __do_softirq+0x221/0x912 kernel/softirq.c:292
>>    invoke_softirq kernel/softirq.c:373 [inline]
>>    irq_exit+0x178/0x1a0 kernel/softirq.c:413
>>    exiting_irq arch/x86/include/asm/apic.h:537 [inline]
>>    smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095
>>    apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
>>    </IRQ>
>> RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581
>> Code: 90 90 41 56 41 55 65 44 8b 2d 64 ea 93 7a 41 54 55 53 0f 1f 44 00  
>> 00
>> e8 96 5b d5 fb e9 07 00 00 00 0f 00 2d 7a 8f 54 00 fb f4 <65> 44 8b 2d 40
>> ea 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
>> RSP: 0018:ffffffff86c07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
>> RAX: 0000000000000007 RBX: ffffffff86c2b200 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86c2ba44
>> RBP: fffffbfff0d85640 R08: ffffffff86c2b200 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>>    cpuidle_idle_call kernel/sched/idle.c:154 [inline]
>>    do_idle+0x3c2/0x4f0 kernel/sched/idle.c:263
>>    cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354
>>    start_kernel+0x838/0x872 init/main.c:785
>>    secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

>> Allocated by task 83:
>>    save_stack+0x1b/0x80 mm/kasan/common.c:69
>>    set_track mm/kasan/common.c:77 [inline]
>>    __kasan_kmalloc mm/kasan/common.c:487 [inline]
>>    __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
>>    kmalloc include/linux/slab.h:552 [inline]
>>    kzalloc include/linux/slab.h:748 [inline]
>>    wdm_create+0x56/0x1720 drivers/usb/class/cdc-wdm.c:786
>>    wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
>>    usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>>    really_probe+0x281/0x6d0 drivers/base/dd.c:548
>>    driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>>    __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>>    bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>>    __device_attach+0x217/0x360 drivers/base/dd.c:894
>>    bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>>    device_add+0xae6/0x16f0 drivers/base/core.c:2165
>>    usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>>    generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>>    usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>>    really_probe+0x281/0x6d0 drivers/base/dd.c:548
>>    driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>>    __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>>    bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>>    __device_attach+0x217/0x360 drivers/base/dd.c:894
>>    bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>>    device_add+0xae6/0x16f0 drivers/base/core.c:2165
>>    usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>>    hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>>    hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>>    port_event drivers/usb/core/hub.c:5359 [inline]
>>    hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>>    process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>>    worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>>    kthread+0x318/0x420 kernel/kthread.c:255
>>    ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

>> Freed by task 83:
>>    save_stack+0x1b/0x80 mm/kasan/common.c:69
>>    set_track mm/kasan/common.c:77 [inline]
>>    __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
>>    slab_free_hook mm/slub.c:1423 [inline]
>>    slab_free_freelist_hook mm/slub.c:1474 [inline]
>>    slab_free mm/slub.c:3016 [inline]
>>    kfree+0xe4/0x2f0 mm/slub.c:3957
>>    wdm_create+0x542/0x1720 drivers/usb/class/cdc-wdm.c:884
>>    wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
>>    usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>>    really_probe+0x281/0x6d0 drivers/base/dd.c:548
>>    driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>>    __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>>    bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>>    __device_attach+0x217/0x360 drivers/base/dd.c:894
>>    bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>>    device_add+0xae6/0x16f0 drivers/base/core.c:2165
>>    usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>>    generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>>    usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>>    really_probe+0x281/0x6d0 drivers/base/dd.c:548
>>    driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>>    __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>>    bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>>    __device_attach+0x217/0x360 drivers/base/dd.c:894
>>    bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>>    device_add+0xae6/0x16f0 drivers/base/core.c:2165
>>    usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>>    hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>>    hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>>    port_event drivers/usb/core/hub.c:5359 [inline]
>>    hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>>    process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>>    worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>>    kthread+0x318/0x420 kernel/kthread.c:255
>>    ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

>> The buggy address belongs to the object at ffff8881cbdca880
>>    which belongs to the cache kmalloc-1k of size 1024
>> The buggy address is located 104 bytes inside of
>>    1024-byte region [ffff8881cbdca880, ffff8881cbdcac80)
>> The buggy address belongs to the page:
>> page:ffffea00072f7200 refcount:1 mapcount:0 mapping:ffff8881da002280
>> index:0x0 compound_mapcount: 0
>> flags: 0x200000000010200(slab|head)
>> raw: 0200000000010200 ffffea000719ca00 0000000400000004 ffff8881da002280
>> raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
>> page dumped because: kasan: bad access detected

>> Memory state around the buggy address:
>>    ffff8881cbdca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>    ffff8881cbdca800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> > ffff8881cbdca880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>                                                             ^
>>    ffff8881cbdca900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>    ffff8881cbdca980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ==================================================================


>> ---
>> This bug is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.

>> syzbot will keep track of this bug report. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

> Most probably the same issue as:

> https://syzkaller.appspot.com/bug?id=07a5f1529b95adcb80cbf8729f9cb499b980991d

> #syz dup: KASAN: use-after-free Read in wdm_out_callback

Can't dup bug to itself.


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: KASAN: use-after-free Read in wdm_out_callback
  2019-09-20 15:41 ` Andrey Konovalov
  2019-09-20 15:41   ` syzbot
@ 2019-09-20 15:42   ` Andrey Konovalov
  1 sibling, 0 replies; 4+ messages in thread
From: Andrey Konovalov @ 2019-09-20 15:42 UTC (permalink / raw)
  To: syzbot
  Cc: baijiaju1990, bigeasy, Colin Ian King, Greg Kroah-Hartman, LKML,
	USB list, syzkaller-bugs, yuehaibing

On Fri, Sep 20, 2019 at 5:41 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> On Mon, Aug 19, 2019 at 4:48 PM syzbot
> <syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    d0847550 usb-fuzzer: main usb gadget fuzzer driver
> > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=136553ba600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
> > dashboard link: https://syzkaller.appspot.com/bug?extid=9a22af9cbb07280ce9cf
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com
> >
> > cdc_wdm 1-1:118.0: nonzero urb status received: -71
> > cdc_wdm 1-1:118.0: wdm_int_callback - 0 bytes
> > ==================================================================
> > BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50
> > kernel/locking/lockdep.c:3753
> > Read of size 8 at addr ffff8881cbdca8e8 by task swapper/0/0
> >
> > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc4+ #26
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Call Trace:
> >   <IRQ>
> >   __dump_stack lib/dump_stack.c:77 [inline]
> >   dump_stack+0xca/0x13e lib/dump_stack.c:113
> >   print_address_description+0x6a/0x32c mm/kasan/report.c:351
> >   __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
> >   kasan_report+0xe/0x12 mm/kasan/common.c:612
> >   __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
> >   lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
> >   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> >   _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
> >   wdm_out_callback+0x45/0x170 drivers/usb/class/cdc-wdm.c:148
> >   __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657
> >   usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722
> >   dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965
> >   call_timer_fn+0x179/0x650 kernel/time/timer.c:1322
> >   expire_timers kernel/time/timer.c:1366 [inline]
> >   __run_timers kernel/time/timer.c:1685 [inline]
> >   __run_timers kernel/time/timer.c:1653 [inline]
> >   run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698
> >   __do_softirq+0x221/0x912 kernel/softirq.c:292
> >   invoke_softirq kernel/softirq.c:373 [inline]
> >   irq_exit+0x178/0x1a0 kernel/softirq.c:413
> >   exiting_irq arch/x86/include/asm/apic.h:537 [inline]
> >   smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095
> >   apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
> >   </IRQ>
> > RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581
> > Code: 90 90 41 56 41 55 65 44 8b 2d 64 ea 93 7a 41 54 55 53 0f 1f 44 00 00
> > e8 96 5b d5 fb e9 07 00 00 00 0f 00 2d 7a 8f 54 00 fb f4 <65> 44 8b 2d 40
> > ea 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
> > RSP: 0018:ffffffff86c07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> > RAX: 0000000000000007 RBX: ffffffff86c2b200 RCX: 0000000000000000
> > RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86c2ba44
> > RBP: fffffbfff0d85640 R08: ffffffff86c2b200 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> >   cpuidle_idle_call kernel/sched/idle.c:154 [inline]
> >   do_idle+0x3c2/0x4f0 kernel/sched/idle.c:263
> >   cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354
> >   start_kernel+0x838/0x872 init/main.c:785
> >   secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
> >
> > Allocated by task 83:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_kmalloc mm/kasan/common.c:487 [inline]
> >   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
> >   kmalloc include/linux/slab.h:552 [inline]
> >   kzalloc include/linux/slab.h:748 [inline]
> >   wdm_create+0x56/0x1720 drivers/usb/class/cdc-wdm.c:786
> >   wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
> >   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
> >   really_probe+0x281/0x6d0 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
> >   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:894
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2165
> >   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
> >   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> >   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
> >   really_probe+0x281/0x6d0 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
> >   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:894
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2165
> >   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
> >   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
> >   port_event drivers/usb/core/hub.c:5359 [inline]
> >   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
> >   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
> >   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > Freed by task 83:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1474 [inline]
> >   slab_free mm/slub.c:3016 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3957
> >   wdm_create+0x542/0x1720 drivers/usb/class/cdc-wdm.c:884
> >   wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922
> >   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
> >   really_probe+0x281/0x6d0 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
> >   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:894
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2165
> >   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
> >   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> >   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
> >   really_probe+0x281/0x6d0 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
> >   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:894
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2165
> >   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
> >   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
> >   port_event drivers/usb/core/hub.c:5359 [inline]
> >   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
> >   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
> >   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > The buggy address belongs to the object at ffff8881cbdca880
> >   which belongs to the cache kmalloc-1k of size 1024
> > The buggy address is located 104 bytes inside of
> >   1024-byte region [ffff8881cbdca880, ffff8881cbdcac80)
> > The buggy address belongs to the page:
> > page:ffffea00072f7200 refcount:1 mapcount:0 mapping:ffff8881da002280
> > index:0x0 compound_mapcount: 0
> > flags: 0x200000000010200(slab|head)
> > raw: 0200000000010200 ffffea000719ca00 0000000400000004 ffff8881da002280
> > raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> >   ffff8881cbdca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff8881cbdca800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > > ffff8881cbdca880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >                                                            ^
> >   ffff8881cbdca900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff8881cbdca980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ==================================================================
> >
> >
> > ---
> > This bug is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@googlegroups.com.
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> Most probably the same issue as:
>
> https://syzkaller.appspot.com/bug?id=07a5f1529b95adcb80cbf8729f9cb499b980991d
>
> #syz dup: KASAN: use-after-free Read in wdm_out_callback

https://syzkaller.appspot.com/bug?id=e236bab6c3d8f2d8f373130a2594897fc593b3fc

#syz dup: KASAN: use-after-free Read in wdm_int_callback

^ permalink raw reply	[flat|nested] 4+ messages in thread

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Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-19 14:48 KASAN: use-after-free Read in wdm_out_callback syzbot
2019-09-20 15:41 ` Andrey Konovalov
2019-09-20 15:41   ` syzbot
2019-09-20 15:42   ` Andrey Konovalov

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