netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11638 Comm: syz-executor1 Not tainted 4.20.0 #387
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__find_plane_by_offset drivers/media/common/videobuf2/videobuf2-core.c:2032 [inline]
RIP: 0010:vb2_mmap+0x23c/0x6f0 drivers/media/common/videobuf2/videobuf2-core.c:2154
Code: 80 3c 10 00 0f 85 21 04 00 00 48 b9 00 00 00 00 00 fc ff df 48 8b 45 b8 48 8b 00 48 8d 78 14 48 89 45 d0 48 89 f8 48 c1 e8 03 <0f> b6 14 08 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 00
RSP: 0018:ffff8881b60577d0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff853db920 RDI: 0000000000000014
RBP: ffff8881b6057820 R08: ffff888180ee0300 R09: ffffed1038744826
R10: ffffed1038744826 R11: ffff8881c3a24137 R12: 0000000000000020
kobject: 'loop2' (000000006ca82aea): kobject_uevent_env
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881ca976f50
FS:  00007efe647a2700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop2' (000000006ca82aea): fill_kobj_path: path = '/devices/virtual/block/loop2'
CR2: 00007ff300b6a2b8 CR3: 00000001b2a8c000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vb2_fop_mmap+0x4b/0x70 drivers/media/common/videobuf2/videobuf2-v4l2.c:1004
 v4l2_mmap+0x153/0x200 drivers/media/v4l2-core/v4l2-dev.c:401
------------[ cut here ]------------
 call_mmap include/linux/fs.h:1862 [inline]
 mmap_region+0xe85/0x1cd0 mm/mmap.c:1786
downgrading a read lock
WARNING: CPU: 0 PID: 11643 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline]
WARNING: CPU: 0 PID: 11643 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819