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SubjectRe: divide error in vivid_vid_cap_s_dv_timings
From
syzbot has found a reproducer for the following crash on:

HEAD commit: 6201f31a39f8 Add linux-next specific files for 20181030
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=178f6999400000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a22859d870756c1
dashboard link: https://syzkaller.appspot.com/bug?extid=57c3d83d71187054d56f
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c44dbd400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15210599400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+57c3d83d71187054d56f@syzkaller.appspotmail.com

divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5676 Comm: syz-executor345 Not tainted 4.19.0-next-20181030+
#101
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:valid_cvt_gtf_timings
drivers/media/platform/vivid/vivid-vid-cap.c:1633 [inline]
RIP: 0010:vivid_vid_cap_s_dv_timings+0x60e/0x11e0
drivers/media/platform/vivid/vivid-vid-cap.c:1664
Code: c6 84 c9 0f 95 c1 40 84 ce 0f 85 ce 0a 00 00 83 e0 07 38 c2 0f 9e c1
84 d2 0f 95 c0 84 c1 0f 85 b9 0a 00 00 48 8b 43 14 31 d2 <41> f7 f7 48 ba
00 00 00 00 00 fc ff df 4c 8d 7b 40 89 85 64 ff ff
RSP: 0018:ffff8801d80a7630 EFLAGS: 00010246
RAX: 0000000000d59f80 RBX: ffff8801d7a9e600 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d7a9e614
RBP: ffff8801d80a76f0 R08: 0000000000000001 R09: ffffed0039694024
R10: ffffed0039694024 R11: ffff8801cb4a0123 R12: ffff8801cb4a0080
R13: 1ffff1003b014ecd R14: 0000000000000000 R15: 0000000000000000
FS: 000000000228d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006cf090 CR3: 00000001d7948000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vidioc_s_dv_timings+0xa4/0xc0 drivers/media/platform/vivid/vivid-core.c:323
v4l_stub_s_dv_timings+0x4f/0x60 drivers/media/v4l2-core/v4l2-ioctl.c:2581
__video_do_ioctl+0x519/0xf00 drivers/media/v4l2-core/v4l2-ioctl.c:2833
video_usercopy+0x5c1/0x1750 drivers/media/v4l2-core/v4l2-ioctl.c:3013
video_ioctl2+0x2c/0x33 drivers/media/v4l2-core/v4l2-ioctl.c:3057
v4l2_ioctl+0x154/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:688
ksys_ioctl+0xa9/0xd0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x444c19
Code: e8 0c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 db ce fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffce23353f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444c19
RDX: 0000000020000000 RSI: 00000000c0845657 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000ffff00000000 R09: 00000000004002e0
R10: 000000000000f8ff R11: 0000000000000213 R12: 000000000000c1b9
R13: 0000000000402010 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace eca9bbb7e84ba3e6 ]---
RIP: 0010:valid_cvt_gtf_timings
drivers/media/platform/vivid/vivid-vid-cap.c:1633 [inline]
RIP: 0010:vivid_vid_cap_s_dv_timings+0x60e/0x11e0
drivers/media/platform/vivid/vivid-vid-cap.c:1664
Code: c6 84 c9 0f 95 c1 40 84 ce 0f 85 ce 0a 00 00 83 e0 07 38 c2 0f 9e c1
84 d2 0f 95 c0 84 c1 0f 85 b9 0a 00 00 48 8b 43 14 31 d2 <41> f7 f7 48 ba
00 00 00 00 00 fc ff df 4c 8d 7b 40 89 85 64 ff ff
RSP: 0018:ffff8801d80a7630 EFLAGS: 00010246
RAX: 0000000000d59f80 RBX: ffff8801d7a9e600 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d7a9e614
RBP: ffff8801d80a76f0 R08: 0000000000000001 R09: ffffed0039694024
R10: ffffed0039694024 R11: ffff8801cb4a0123 R12: ffff8801cb4a0080
R13: 1ffff1003b014ecd R14: 0000000000000000 R15: 0000000000000000
FS: 000000000228d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006cf090 CR3: 00000001d7948000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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