------------[ cut here ]------------
le32_to_cpu(aed->lengthAllocDescs) != epos->offset - sizeof(struct allocExtDesc)
WARNING: fs/udf/inode.c:2088 at __udf_add_aext+0x524/0x6d0 fs/udf/inode.c:2087, CPU#0: syz.0.0/5318
Modules linked in:
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__udf_add_aext+0x524/0x6d0 fs/udf/inode.c:2087
Code: 8f dc fe 49 8b 3e 4c 89 e6 e8 38 88 02 ff 31 c0 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 6d c2 70 fe 90 <0f> 0b 90 e9 14 fc ff ff e8 5f c2 70 fe 90 0f 0b 90 e9 66 fd ff ff
RSP: 0018:ffffc9000c4ef0a0 EFLAGS: 00010287
RAX: ffffffff8354e6b3 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000000d3e RDI: 0000000000000d3f
RBP: 1ffff9200189de99 R08: ffff888000300000 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000003 R14: ffffc9000c4ef4c0 R15: ffffc9000c4ef4c8
FS:  00007f670b99f6c0(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f670b976000 CR3: 0000000034213000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_add_aext fs/udf/inode.c:2145 [inline]
 udf_do_extend_file+0x90c/0x11e0 fs/udf/inode.c:591
 inode_getblk fs/udf/inode.c:843 [inline]
 udf_map_block+0xfff/0x4330 fs/udf/inode.c:454
 __udf_get_block+0x52/0x250 fs/udf/inode.c:468
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2142
 block_write_begin+0x8d/0x120 fs/buffer.c:2253
 udf_write_begin+0x118/0x270 fs/udf/inode.c:262
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4314
 udf_file_write_iter+0x2ca/0x6b0 fs/udf/file.c:112
 aio_write+0x5cd/0x870 fs/aio.c:1633
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x7bb/0x14c0 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2081
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f670ab9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f670b99efe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f670ae16090 RCX: 00007f670ab9c799
RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f670b976000
RBP: 00007f670ac32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f670ae16128 R14: 00007f670ae16090 R15: 00007ffd3f21fb88
 </TASK>