linux-kernel - WARNING in get_q

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Date:   Tue, 29 Jan 2019 08:43:04 -0800
From:   syzbot <syzbot+44b24cff6bf96006ecfa@...kaller.appspotmail.com>
To:     hans.verkuil@...co.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, mchehab@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: WARNING in get_q_data

Hello,

syzbot found the following crash on:

HEAD commit:    39ad1c1b6bb8 Add linux-next specific files for 20190129
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=127d3eef400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a2b2e9c0bc43c14d
dashboard link: https://syzkaller.appspot.com/bug?extid=44b24cff6bf96006ecfa
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126417a0c00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16aa880f400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+44b24cff6bf96006ecfa@...kaller.appspotmail.com

WARNING: CPU: 1 PID: 7479 at  
drivers/media/platform/vicodec/vicodec-core.c:151 get_q_data  
drivers/media/platform/vicodec/vicodec-core.c:151 [inline]
WARNING: CPU: 1 PID: 7479 at  
drivers/media/platform/vicodec/vicodec-core.c:151 get_q_data+0x53/0x80  
drivers/media/platform/vicodec/vicodec-core.c:140
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7479 Comm: syz-executor073 Not tainted 5.0.0-rc4-next-20190129  
#21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
  panic+0x2cb/0x65c kernel/panic.c:214
  __warn.cold+0x20/0x48 kernel/panic.c:571
  report_bug+0x263/0x2b0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  fixup_bug arch/x86/kernel/traps.c:173 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
  do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:get_q_data drivers/media/platform/vicodec/vicodec-core.c:151  
[inline]
RIP: 0010:get_q_data+0x53/0x80  
drivers/media/platform/vicodec/vicodec-core.c:140
Code: 74 3a 83 fb 02 75 1e e8 eb 6e 33 fc 49 81 c4 70 02 00 00 e8 df 6e 33  
fc 4c 89 e0 5b 41 5c 5d c3 83 fb 0a 74 e2 e8 cd 6e 33 fc <0f> 0b e8 c6 6e  
33 fc 45 31 e4 5b 4c 89 e0 41 5c 5d c3 e8 b6 6e 33
RSP: 0018:ffff88808638f758 EFLAGS: 00010293
RAX: ffff888097a02400 RBX: 000000000000000c RCX: ffffffff854eab2f
RDX: 0000000000000000 RSI: ffffffff854eab63 RDI: 0000000000000005
RBP: ffff88808638f768 R08: ffff888097a02400 R09: ffffed10136ec909
R10: ffffed10136ec908 R11: ffff88809b764843 R12: ffff888098c484c0
R13: 0000000000000002 R14: ffff888098c484c0 R15: ffff88808638f7e4
  vidioc_s_selection+0x9b/0x3e0  
drivers/media/platform/vicodec/vicodec-core.c:997
  v4l_s_selection drivers/media/v4l2-core/v4l2-ioctl.c:2245 [inline]
  v4l_s_crop+0x32a/0x510 drivers/media/v4l2-core/v4l2-ioctl.c:2302
  __video_do_ioctl+0x805/0xd80 drivers/media/v4l2-core/v4l2-ioctl.c:2872
  video_usercopy+0x460/0x16b0 drivers/media/v4l2-core/v4l2-ioctl.c:3054
  video_ioctl2+0x2d/0x35 drivers/media/v4l2-core/v4l2-ioctl.c:3098
  v4l2_ioctl+0x156/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440089
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe747247e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089
RDX: 0000000020000100 RSI: 000000004014563c RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401910
R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


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