kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 21017 Comm: syz-executor.1 Not tainted 4.9.141+ #23
task: ffff8801cbee2f80 task.stack: ffff8801c9138000
RIP: 0010:[<ffffffff81de0a58>]  [<ffffffff81de0a58>] is_loop_device drivers/block/loop.c:645 [inline]
RIP: 0010:[<ffffffff81de0a58>]  [<ffffffff81de0a58>] loop_validate_file+0x208/0x400 drivers/block/loop.c:656
RSP: 0018:ffff8801c913fc88  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81de0a28 RDI: 00000000000001b0
RBP: ffff8801c913fca0 R08: ffff8801cbee3830 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801da017300 R14: ffff8801da017300 R15: ffff8801d8ccced8
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000f7794b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fff4a27ee0c CR3: 00000001d85f9000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d8cccd80 ffff8801ceae7800 00000000fffffff0 ffff8801c913fd28
 ffffffff81de7b85 ffff88021fffd017 ffff8801d7634588 0000000000000001
 ffff8801d7a53658 0000000000000000 ffff8801d8ccced0 1ffff10039227fa8
Call Trace:
 [<ffffffff81de7b85>] loop_set_fd drivers/block/loop.c:909 [inline]
 [<ffffffff81de7b85>] lo_ioctl+0x865/0x1910 drivers/block/loop.c:1375
 [<ffffffff81de8cdc>] lo_compat_ioctl+0xac/0x140 drivers/block/loop.c:1574
 [<ffffffff81b3c2e4>] compat_blkdev_ioctl+0x3a4/0x3630 block/compat_ioctl.c:751
 [<ffffffff81619c8d>] C_SYSC_ioctl fs/compat_ioctl.c:1602 [inline]
 [<ffffffff81619c8d>] compat_SyS_ioctl+0x12d/0x1fd0 fs/compat_ioctl.c:1549
 [<ffffffff81006311>] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline]
 [<ffffffff81006311>] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390
 [<ffffffff82818de0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f7 01 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 cc 01 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 
RIP  [<ffffffff81de0a58>] is_loop_device drivers/block/loop.c:645 [inline]
RIP  [<ffffffff81de0a58>] loop_validate_file+0x208/0x400 drivers/block/loop.c:656
 RSP <ffff8801c913fc88>
---[ end trace 86e7f59ece6ae638 ]---