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: 1 PID: 4831 Comm: syz-executor1 Not tainted 4.9.141+ #1
task: ffff8801a97daf80 task.stack: ffff8801d2ba8000
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:ffff8801d2bafae0  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90003977000
RDX: 0000000000000094 RSI: ffffffff81de0a28 RDI: 00000000000001b0
RBP: ffff8801d2bafaf8 R08: ffff8801a97db830 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801d91a9140 R14: ffff8801d91a9140 R15: ffff8801d8d9a0d8
FS:  00007f7004a96700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff884a3020 CR3: 00000001d6b1b000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d8d99f80 ffff8801cc673200 00000000fffffff0 ffff8801d2bafb80
 ffffffff81de7b85 0000000000000001 000000000000000e 0000000000000000
 ffff8801d2bafb80 ffff8801d2bafde0 ffff8801d8d9a0d0 1ffff1003a575f6c
Call Trace:
 [<ffffffff81de7b85>] loop_set_fd drivers/block/loop.c:909 [inline]
 [<ffffffff81de7b85>] lo_ioctl+0x865/0x1910 drivers/block/loop.c:1375
 [<ffffffff81b0cf54>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81b0cf54>] blkdev_ioctl+0x7a4/0x1a50 block/ioctl.c:590
 [<ffffffff815ca29e>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff81546dec>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff81546dec>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff81546dec>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff81547e6f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff81547e6f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
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 <ffff8801d2bafae0>
---[ end trace 370c846f3ba44c53 ]---