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From:   Rondreis <linhaoguo86@gmail.com>
Date:   Fri, 23 Sep 2022 23:11:57 +0800
Message-ID: <CAB7eex+r2g4HhL1D-M26+N7e=S3zKMTk_4FETXqkx4A73Y+w5g@mail.gmail.com>
Subject: WARNING in vb2_start_streaming
To:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org,
        christian.koenig@amd.com
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Hello,

When fuzzing the Linux kernel driver v6.0-rc6, the following crash was
triggered.

HEAD commit: 521a547ced6477c54b4b0cc206000406c221b4d6
git tree: upstream

kernel config: https://pastebin.com/raw/hekxU61F
console output: https://pastebin.com/raw/ZSCg16sG

Sorry for failing to extract the reproducer. But on other versions of
Linux, I also triggered this crash.

I would appreciate it if you have any idea how to solve this bug.

The crash report is as follows:

msi2500 2-1:1.0: failed -32, cmd 41, data 608008
usb 2-1: selecting invalid altsetting 1
msi2500 2-1:1.0: failed -32, cmd 43, data 0000
------------[ cut here ]------------
WARNING: CPU: 1 PID: 18451 at
drivers/media/common/videobuf2/videobuf2-core.c:1612
vb2_start_streaming+0x246/0x4c0
drivers/media/common/videobuf2/videobuf2-core.c:1612
Modules linked in:
CPU: 1 PID: 18451 Comm: syz-fuzzer Not tainted 6.0.0-rc4+ #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:vb2_start_streaming+0x246/0x4c0
drivers/media/common/videobuf2/videobuf2-core.c:1612
Code: 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85
04 02 00 00 48 8b 83 60 02 00 00 48 39 c5 74 0c e8 9a 5a 63 fb <0f> 0b
eb 03 45 31 e4 e8 8e 5a 63 fb 44 89 e0 48 83 c4 10 5b 5d 41
RSP: 0018:ffffc9001457fb18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88804eb987f0 RCX: ffff88801ab91d40
RDX: 0000000000000000 RSI: ffff88801ab91d40 RDI: 0000000000000002
RBP: ffff88804eb98a50 R08: ffffffff86178d96 R09: 0000000000000000
R10: 0000000000000005 R11: ffffed1009d73149 R12: 00000000ffffffe0
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000008
FS: 000000c001d53090(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f620c0431a8 CR3: 000000001d598000 CR4: 0000000000350ee0
Call Trace:
<TASK>
vb2_core_streamon drivers/media/common/videobuf2/videobuf2-core.c:2113 [inline]
vb2_core_streamon+0x1da/0x2c0
drivers/media/common/videobuf2/videobuf2-core.c:2080
__vb2_init_fileio+0xa18/0xcf0
drivers/media/common/videobuf2/videobuf2-core.c:2685
vb2_core_poll+0x4d2/0x7c0 drivers/media/common/videobuf2/videobuf2-core.c:2465
vb2_poll+0x31/0x150 drivers/media/common/videobuf2/videobuf2-v4l2.c:970
vb2_fop_poll+0x10e/0x360 drivers/media/common/videobuf2/videobuf2-v4l2.c:1217
v4l2_poll+0x158/0x220 drivers/media/v4l2-core/v4l2-dev.c:348
vfs_poll include/linux/poll.h:88 [inline]
ep_item_poll.isra.0+0xd8/0x170 fs/eventpoll.c:853
ep_insert fs/eventpoll.c:1522 [inline]
do_epoll_ctl+0x1bc4/0x3080 fs/eventpoll.c:2163
__do_sys_epoll_ctl fs/eventpoll.c:2214 [inline]
__se_sys_epoll_ctl fs/eventpoll.c:2205 [inline]
__x64_sys_epoll_ctl+0x13f/0x1c0 fs/eventpoll.c:2205
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x466938
Code: 10 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24
08 8b 74 24 0c 8b 54 24 10 4c 8b 54 24 18 b8 e9 00 00 00 0f 05 <89> 44
24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44
RSP: 002b:000000c0042bda88 EFLAGS: 00000206 ORIG_RAX: 00000000000000e9
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000466938
RDX: 000000000000002d RSI: 0000000000000001 RDI: 0000000000000003
RBP: 000000c0042bdad8 R08: 0000000000000000 R09: 0000000000000060
R10: 000000c0042bdac4 R11: 0000000000000206 R12: 0000000000203000
R13: 0000000000000050 R14: 000000c000092340 R15: 00007f94d7f54c87
</TASK>