general protection fault in rose_send_frame

general protection fault in rose_send_frame

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13a9acf7400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76
dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
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+7078ae989d857fe17988@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10446 Comm: syz-executor4 Not tainted 4.20.0+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 d0 e3
RSP: 0018:ffff8880ae707780 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8882167d4540 RCX: ffffffff8703c0bb
RDX: 000000000000006b RSI: ffffffff8703c1ec RDI: 0000000000000358
kobject: 'loop1' (000000008f9686c7): kobject_uevent_env
RBP: ffff8880ae7077b0 R08: ffff888089dc0480 R09: ffffed1014360d0d
kobject: 'loop1' (000000008f9686c7): fill_kobj_path: path  
= '/devices/virtual/block/loop1'
R10: ffffed1014360d0c R11: ffff8880a1b06863 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff888096c38a40
FS:  00007fb08678e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000000645e0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  <IRQ>
  rose_transmit_clear_request+0x1de/0x2a0 net/rose/rose_link.c:258
  rose_rx_call_request+0x4f8/0x1c40 net/rose/af_rose.c:999
  rose_loopback_timer+0x26a/0x3f0 net/rose/rose_loopback.c:100
  call_timer_fn+0x254/0x900 kernel/time/timer.c:1325
  expire_timers kernel/time/timer.c:1362 [inline]
  __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681
  run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694
  __do_softirq+0x30b/0xb11 kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x180/0x1d0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
  </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766  
[inline]
RIP: 0010:lock_is_held_type+0x17e/0x210 kernel/locking/lockdep.c:3881
Code: 00 00 00 fc ff df 41 c7 85 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c  
10 00 75 63 48 83 3d b9 0a 2f 08 00 74 30 48 89 df 57 9d <0f> 1f 44 00 00  
48 83 c4 08 44 89 e0 5b 41 5c 41 5d 5d c3 48 83 c4
RSP: 0018:ffff888065f8eea8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1324a06 RBX: 0000000000000282 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: ffff888065f8eec8 R08: ffff888089dc0480 R09: ffffed100cbf1df3
R10: ffffed100cbf1df2 R11: 0000000000000003 R12: 0000000000000000
R13: ffff888089dc0480 R14: dffffc0000000000 R15: ffffea0001de25c0
  lock_is_held include/linux/lockdep.h:337 [inline]
  xa_entry include/linux/xarray.h:902 [inline]
  xas_reload include/linux/xarray.h:1250 [inline]
  find_get_pages_range_tag+0x1166/0x1540 mm/filemap.c:1848
  pagevec_lookup_range_tag+0x40/0x80 mm/swap.c:1005
  mpage_prepare_extent_to_map+0x402/0x1950 fs/ext4/inode.c:2661
  ext4_writepages+0x1a5e/0x4180 fs/ext4/inode.c:2881
  do_writepages+0x99/0x1a0 mm/page-writeback.c:2328
  __filemap_fdatawrite_range+0x352/0x470 mm/filemap.c:411
  filemap_write_and_wait_range mm/filemap.c:633 [inline]
  filemap_write_and_wait_range+0x4b/0xd0 mm/filemap.c:627
  __generic_file_write_iter+0x4ea/0x630 mm/filemap.c:3251
  ext4_file_write_iter+0x37a/0x1410 fs/ext4/file.c:266
  call_write_iter include/linux/fs.h:1857 [inline]
  new_sync_write fs/read_write.c:474 [inline]
  __vfs_write+0x6e5/0xa80 fs/read_write.c:487
  vfs_write+0x20c/0x560 fs/read_write.c:549
  ksys_write+0x105/0x260 fs/read_write.c:598
  __do_sys_write fs/read_write.c:610 [inline]
  __se_sys_write fs/read_write.c:607 [inline]
  __x64_sys_write+0x73/0xb0 fs/read_write.c:607
  do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb08678dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 00000000fffffcbe RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb08678e6d4
R13: 00000000004c7155 R14: 00000000004dc898 R15: 00000000ffffffff
Modules linked in:
---[ end trace bd566e08b493d14b ]---
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 d0 e3
RSP: 0018:ffff8880ae707780 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8882167d4540 RCX: ffffffff8703c0bb
RDX: 000000000000006b RSI: ffffffff8703c1ec RDI: 0000000000000358
RBP: ffff8880ae7077b0 R08: ffff888089dc0480 R09: ffffed1014360d0d
R10: ffffed1014360d0c R11: ffff8880a1b06863 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff888096c38a40
FS:  00007fb08678e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000000645e0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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#bug-status-tracking for how to communicate with  
syzbot.

Re: general protection fault in rose_send_frame

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    9fb20801dab4 net: Fix ip_mc_{dec,inc}_group allocation con..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17530a0f400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=33ad02b9305759c3
dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=148b35f8c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7078ae989d857fe17988@syzkaller.appspotmail.com

8021q: adding VLAN 0 to HW filter on device batadv0
device rose0 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_CHANGE): rose0: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7801 Comm: udevd Not tainted 5.0.0-rc4+ #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 60 cd
RSP: 0000:ffff8880ae907ae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809a954500 RCX: ffffffff86360ccb
RDX: 000000000000006b RSI: ffffffff86360dfc RDI: 0000000000000358
RBP: ffff8880ae907b18 R08: ffff888094b50080 R09: ffffed10146ad41d
R10: ffffed10146ad41c R11: ffff8880a356a0e3 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff8880a886acc0
FS:  00007f75710e57a0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7570790590 CR3: 000000009fb95000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  <IRQ>
  rose_transmit_clear_request+0x1de/0x2a0 net/rose/rose_link.c:258
  rose_rx_call_request+0x4ea/0x1990 net/rose/af_rose.c:999
  rose_loopback_timer+0x26a/0x3f0 net/rose/rose_loopback.c:100
  call_timer_fn+0x190/0x720 kernel/time/timer.c:1325
  expire_timers kernel/time/timer.c:1362 [inline]
  __run_timers kernel/time/timer.c:1681 [inline]
  __run_timers kernel/time/timer.c:1649 [inline]
  run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694
  __do_softirq+0x266/0x95a kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x180/0x1d0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
  </IRQ>
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1/0x20 kernel/kcov.c:174
Code: c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89  
e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 <40> 0f b6 d6 40  
0f b6 f7 bf 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6
RSP: 0000:ffff8880a806fb90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff888094b50080 RBX: ffff8880a806fca8 RCX: ffffffff818a7cde
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880a806fcd0 R08: ffff888094b50080 R09: 0000000000000004
R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: ffffea000025f980
R13: ffff88809b8a87b8 R14: 0000000000000001 R15: 0000000000000084
  do_fault_around mm/memory.c:3391 [inline]
  do_read_fault mm/memory.c:3425 [inline]
  do_fault mm/memory.c:3556 [inline]
  handle_pte_fault mm/memory.c:3787 [inline]
  __handle_mm_fault+0x3226/0x3f20 mm/memory.c:3911
  handle_mm_fault+0x43f/0xb30 mm/memory.c:3948
  do_user_addr_fault arch/x86/mm/fault.c:1475 [inline]
  __do_page_fault+0x5da/0xd60 arch/x86/mm/fault.c:1541
  do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1572
  page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143
RIP: 0033:0x7f7570790590
Code: 00 74 0f f0 ff 0d ac 41 31 00 0f 85 d3 6b 00 00 eb 0c ff 0d 9e 41 31  
00 0f 85 c5 6b 00 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 <8b> 0d 4e 1b 31  
00 85 c9 7e 6c 48 8b 15 97 41 31 00 48 8b 05 78 17
RSP: 002b:00007ffec2e21978 EFLAGS: 00010206
RAX: 00007f7570aa4740 RBX: 00007ffec2e219a0 RCX: 00007f75705162a0
RDX: 00007f7570790590 RSI: 00007f7570512240 RDI: 00007f7570aa26c0
RBP: 00007ffec2e219e0 R08: 0000000000001ce4 R09: 0000000000001ce4
R10: 00007f7570512240 R11: 00007f75710e57a0 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f75710f0040 R15: 0000000000000005
Modules linked in:
---[ end trace 19f243a97b44aa5b ]---
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 60 cd
RSP: 0000:ffff8880ae907ae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809a954500 RCX: ffffffff86360ccb
RDX: 000000000000006b RSI: ffffffff86360dfc RDI: 0000000000000358
RBP: ffff8880ae907b18 R08: ffff888094b50080 R09: ffffed10146ad41d
R10: ffffed10146ad41c R11: ffff8880a356a0e3 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff8880a886acc0
FS:  00007f75710e57a0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7570790590 CR3: 000000009fb95000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Re: general protection fault in rose_send_frame

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    7a25c6c0aac8 rocker: Add missing break for PRE_BRIDGE_FLAGS
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=104002d8c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=58cb9d752ba5f3e0
dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1224c304c00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=151824f8c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7078ae989d857fe17988@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): rose0: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.0.0-rc7+ #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 f0 53
RSP: 0018:ffff8880ae807ae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809aa1fa00 RCX: ffffffff86378efb
RDX: 000000000000006b RSI: ffffffff8637902c RDI: 0000000000000358
RBP: ffff8880ae807b18 R08: ffffffff8887dec0 R09: ffffed101263146d
R10: ffffed101263146c R11: ffff88809318a363 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff8880a4f6fbc0
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f23b3e4ee78 CR3: 000000009eef3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  <IRQ>
  rose_transmit_clear_request+0x1de/0x2a0 net/rose/rose_link.c:258
  rose_rx_call_request+0x4ea/0x1990 net/rose/af_rose.c:1001
  rose_loopback_timer+0x26a/0x3f0 net/rose/rose_loopback.c:100
  call_timer_fn+0x190/0x720 kernel/time/timer.c:1325
  expire_timers kernel/time/timer.c:1362 [inline]
  __run_timers kernel/time/timer.c:1681 [inline]
  __run_timers kernel/time/timer.c:1649 [inline]
  run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694
  __do_softirq+0x266/0x95a kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x180/0x1d0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
  </IRQ>
RIP: 0010:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
Code: ff ff ff 48 89 c7 48 89 45 d8 e8 59 6c a1 fa 48 8b 45 d8 e9 ce fe ff  
ff 48 89 df e8 48 6c a1 fa eb 82 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66  
2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffffffff88807d08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1125061 RBX: ffffffff8887dec0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8887e73c
RBP: ffffffff88807d38 R08: ffffffff8887dec0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff889282f8 R14: 0000000000000000 R15: 0000000000000000
  arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:555
  default_idle_call+0x36/0x90 kernel/sched/idle.c:93
  cpuidle_idle_call kernel/sched/idle.c:153 [inline]
  do_idle+0x386/0x570 kernel/sched/idle.c:262
  cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:353
  rest_init+0x245/0x37b init/main.c:442
  arch_call_rest_init+0xe/0x1b
  start_kernel+0x803/0x83c init/main.c:739
  x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
  x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
  secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Modules linked in:
---[ end trace 8f29030702ddb052 ]---
RIP: 0010:rose_send_frame+0x1a8/0x280 net/rose/rose_link.c:104
Code: c1 ea 03 80 3c 02 00 0f 85 8d 00 00 00 48 b8 00 00 00 00 00 fc ff df  
4c 8b 63 20 49 8d bc 24 58 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
7e 49 8b 94 24 58 03 00 00 e9 b8 fe ff ff e8 f0 53
RSP: 0018:ffff8880ae807ae8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809aa1fa00 RCX: ffffffff86378efb
RDX: 000000000000006b RSI: ffffffff8637902c RDI: 0000000000000358
RBP: ffff8880ae807b18 R08: ffffffff8887dec0 R09: ffffed101263146d
R10: ffffed101263146c R11: ffff88809318a363 R12: 0000000000000000
R13: 0000000000000078 R14: 0000000000000005 R15: ffff8880a4f6fbc0
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f23b3e4ee78 CR3: 000000009eef3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Re: general protection fault in rose_send_frame

[syzbot]

Bisection is inconclusive: the bug happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14e635fb200000
start commit:   [unknown
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16e635fb200000
console output: https://syzkaller.appspot.com/x/log.txt?x=12e635fb200000
dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1688239f200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1059214f200000

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: general protection fault in rose_send_frame

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 3b3fd068c56e3fbea30090859216a368398e39bf
Author: Anmol Karn <anmol.karan123@gmail.com>
Date:   Thu Nov 19 19:10:43 2020 +0000

    rose: Fix Null pointer dereference in rose_send_frame()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=139e2b9b500000
start commit:   23ee3e4e Merge tag 'pci-v5.8-fixes-2' of git://git.kernel...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=157e8964900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10046c54900000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: rose: Fix Null pointer dereference in rose_send_frame()

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: general protection fault in rose_send_frame

[Dmitry Vyukov]

On Sun, Dec 20, 2020 at 2:27 PM syzbot
<syzbot+7078ae989d857fe17988@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 3b3fd068c56e3fbea30090859216a368398e39bf
> Author: Anmol Karn <anmol.karan123@gmail.com>
> Date:   Thu Nov 19 19:10:43 2020 +0000
>
>     rose: Fix Null pointer dereference in rose_send_frame()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=139e2b9b500000
> start commit:   23ee3e4e Merge tag 'pci-v5.8-fixes-2' of git://git.kernel...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
> dashboard link: https://syzkaller.appspot.com/bug?extid=7078ae989d857fe17988
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=157e8964900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10046c54900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: rose: Fix Null pointer dereference in rose_send_frame()
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: rose: Fix Null pointer dereference in rose_send_frame()