* usb/media/imon: null-ptr-deref in imon_probe
@ 2017-10-09 17:50 Andrey Konovalov
2017-10-09 18:26 ` arvindY
0 siblings, 1 reply; 2+ messages in thread
From: Andrey Konovalov @ 2017-10-09 17:50 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Sean Young, Hans Verkuil, Arvind Yadav,
Andi Shyti, Sakari Ailus, Daniel Wagner, Arnd Bergmann,
linux-media, LKML
Cc: Dmitry Vyukov, Kostya Serebryany, syzkaller
Hi!
I've got the following report while fuzzing the kernel with syzkaller.
On commit 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f (4.14-rc4).
It seems that the return value of usb_ifnum_to_if() can be NULL and
needs to be checked.
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
Modules linked in:
CPU: 1 PID: 1497 Comm: kworker/1:1 Not tainted
4.14.0-rc4-43418-g43a3f84d2109-dirty #380
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: usb_hub_wq hub_event
task: ffff88006a5618c0 task.stack: ffff880068bc8000
RIP: 0010:imon_probe+0x231/0x3f10 drivers/media/rc/imon.c:2519
RSP: 0018:ffff880068bce2d8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff8800627dd500 RCX: 0000000000000027
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000138
RBP: ffff880068bce5e8 R08: ffff88006a5618c0 R09: ffffffff84b380fc
R10: ffff880068bce2c8 R11: 1ffff1000d4ac5b3 R12: ffff880061830000
R13: ffff880061830008 R14: ffffffff883fa200 R15: ffffffff883fa080
FS: 0000000000000000(0000) GS:ffff88006c500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000206cbffc CR3: 0000000061085000 CR4: 00000000000006e0
Call Trace:
usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361
really_probe drivers/base/dd.c:413
driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
__device_attach+0x26e/0x3d0 drivers/base/dd.c:710
device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
device_add+0xd0b/0x1660 drivers/base/core.c:1835
usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932
generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174
usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266
really_probe drivers/base/dd.c:413
driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
__device_attach+0x26e/0x3d0 drivers/base/dd.c:710
device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
device_add+0xd0b/0x1660 drivers/base/core.c:1835
usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457
hub_port_connect drivers/usb/core/hub.c:4903
hub_port_connect_change drivers/usb/core/hub.c:5009
port_event drivers/usb/core/hub.c:5115
hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195
process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119
worker_thread+0x221/0x1850 kernel/workqueue.c:2253
kthread+0x3a1/0x470 kernel/kthread.c:231
ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
Code: ff e8 a4 81 cb 01 31 f6 48 89 df e8 2a cc 65 ff 0f ae f0 48 8d
b8 38 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80>
3c 11 00 0f 85 e8 31 00 00 48 8b 98 38 01 00 00 0f ae f0 44
RIP: imon_probe+0x231/0x3f10 RSP: ffff880068bce2d8
---[ end trace 07febd2eebe02f84 ]---
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: usb/media/imon: null-ptr-deref in imon_probe
2017-10-09 17:50 usb/media/imon: null-ptr-deref in imon_probe Andrey Konovalov
@ 2017-10-09 18:26 ` arvindY
0 siblings, 0 replies; 2+ messages in thread
From: arvindY @ 2017-10-09 18:26 UTC (permalink / raw)
To: Andrey Konovalov, Mauro Carvalho Chehab, Sean Young,
Hans Verkuil, Andi Shyti, Sakari Ailus, Daniel Wagner,
Arnd Bergmann, linux-media, LKML
Cc: Dmitry Vyukov, Kostya Serebryany, syzkaller
Hi Andrey,
I have added NULL check for usb_ifnum_to_if() and send a patch.
Please re-test it.
~arvind
On Monday 09 October 2017 11:20 PM, Andrey Konovalov wrote:
> Hi!
>
> I've got the following report while fuzzing the kernel with syzkaller.
>
> On commit 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f (4.14-rc4).
>
> It seems that the return value of usb_ifnum_to_if() can be NULL and
> needs to be checked.
>
> 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
> Modules linked in:
> CPU: 1 PID: 1497 Comm: kworker/1:1 Not tainted
> 4.14.0-rc4-43418-g43a3f84d2109-dirty #380
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Workqueue: usb_hub_wq hub_event
> task: ffff88006a5618c0 task.stack: ffff880068bc8000
> RIP: 0010:imon_probe+0x231/0x3f10 drivers/media/rc/imon.c:2519
> RSP: 0018:ffff880068bce2d8 EFLAGS: 00010206
> RAX: 0000000000000000 RBX: ffff8800627dd500 RCX: 0000000000000027
> RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000138
> RBP: ffff880068bce5e8 R08: ffff88006a5618c0 R09: ffffffff84b380fc
> R10: ffff880068bce2c8 R11: 1ffff1000d4ac5b3 R12: ffff880061830000
> R13: ffff880061830008 R14: ffffffff883fa200 R15: ffffffff883fa080
> FS: 0000000000000000(0000) GS:ffff88006c500000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000206cbffc CR3: 0000000061085000 CR4: 00000000000006e0
> Call Trace:
> usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361
> really_probe drivers/base/dd.c:413
> driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
> __device_attach_driver+0x230/0x290 drivers/base/dd.c:653
> bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
> __device_attach+0x26e/0x3d0 drivers/base/dd.c:710
> device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
> bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
> device_add+0xd0b/0x1660 drivers/base/core.c:1835
> usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932
> generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174
> usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266
> really_probe drivers/base/dd.c:413
> driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
> __device_attach_driver+0x230/0x290 drivers/base/dd.c:653
> bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
> __device_attach+0x26e/0x3d0 drivers/base/dd.c:710
> device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
> bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
> device_add+0xd0b/0x1660 drivers/base/core.c:1835
> usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457
> hub_port_connect drivers/usb/core/hub.c:4903
> hub_port_connect_change drivers/usb/core/hub.c:5009
> port_event drivers/usb/core/hub.c:5115
> hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195
> process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119
> worker_thread+0x221/0x1850 kernel/workqueue.c:2253
> kthread+0x3a1/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
> Code: ff e8 a4 81 cb 01 31 f6 48 89 df e8 2a cc 65 ff 0f ae f0 48 8d
> b8 38 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80>
> 3c 11 00 0f 85 e8 31 00 00 48 8b 98 38 01 00 00 0f ae f0 44
> RIP: imon_probe+0x231/0x3f10 RSP: ffff880068bce2d8
> ---[ end trace 07febd2eebe02f84 ]---
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-10-09 17:50 usb/media/imon: null-ptr-deref in imon_probe Andrey Konovalov
2017-10-09 18:26 ` arvindY
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