BUG: unable to handle kernel paging request in tpg_fill_plane_buffer

* BUG: unable to handle kernel paging request in tpg_fill_plane_buffer
@ 2018-11-27  7:01 syzbot
  2018-12-25 12:37 ` syzbot
  2019-04-10  4:44 ` syzbot
  0 siblings, 2 replies; 3+ messages in thread
From: syzbot @ 2018-11-27  7:01 UTC (permalink / raw)
  To: bwinther, hverkuil, keescook, linux-kernel, linux-media, mchehab,
	syzkaller-bugs

Hello,

syzbot found the following crash on:

HEAD commit:    6f8b52ba442c Merge tag 'hwmon-for-v4.20-rc5' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15fd354d400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c94f9f0c0363db4b
dashboard link: https://syzkaller.appspot.com/bug?extid=aa8212f63ea8ffaf3bfa
compiler:       gcc (GCC) 8.0.1 20180413 (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+aa8212f63ea8ffaf3bfa@syzkaller.appspotmail.com

BUG: unable to handle kernel paging request at ffffc90005b5c340
PGD 1da95a067 P4D 1da95a067 PUD 1da95b067 PMD 1c4863067 PTE 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5439 Comm: vivid-000-vid-c Not tainted 4.20.0-rc4+ #130
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3  
48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f  
80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RSP: 0018:ffff888150467518 EFLAGS: 00010246
RAX: ffffc90005b5c340 RBX: 0000000000000080 RCX: 0000000000000080
RDX: 0000000000000080 RSI: ffffc90001da3000 RDI: ffffc90005b5c340
RBP: ffff888150467538 R08: fffff52000b6b878 R09: fffff52000b6b868
R10: fffff52000b6b877 R11: ffffc90005b5c3bf R12: ffffc90005b5c340
R13: ffffc90001da3000 R14: dffffc0000000000 R15: ffff8881cb2c5e50
FS:  0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005b5c340 CR3: 00000001846a4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  memcpy include/linux/string.h:352 [inline]
  tpg_fill_plane_pattern drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2382  
[inline]
  tpg_fill_plane_buffer+0x193f/0x44c0  
drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2481
  vivid_fillbuff+0x1d0d/0x68e0  
drivers/media/platform/vivid/vivid-kthread-cap.c:473
  vivid_thread_vid_cap_tick  
drivers/media/platform/vivid/vivid-kthread-cap.c:709 [inline]
  vivid_thread_vid_cap+0xbc1/0x2650  
drivers/media/platform/vivid/vivid-kthread-cap.c:813
  kthread+0x35a/0x440 kernel/kthread.c:246
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: ffffc90005b5c340
---[ end trace 22cabf1d47b26daf ]---
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3  
48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f  
80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
RSP: 0018:ffff888150467518 EFLAGS: 00010246
RAX: ffffc90005b5c340 RBX: 0000000000000080 RCX: 0000000000000080
RDX: 0000000000000080 RSI: ffffc90001da3000 RDI: ffffc90005b5c340
RBP: ffff888150467538 R08: fffff52000b6b878 R09: fffff52000b6b868
R10: fffff52000b6b877 R11: ffffc90005b5c3bf R12: ffffc90005b5c340
R13: ffffc90001da3000 R14: dffffc0000000000 R15: ffff8881cb2c5e50
FS:  0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005b5c340 CR3: 00000001846a4000 CR4: 00000000001406f0
kobject: 'loop0' (00000000664d120c): kobject_uevent_env
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'loop0' (00000000664d120c): fill_kobj_path: path  
= '/devices/virtual/block/loop0'
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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