------------[ cut here ]------------
le32_to_cpu(aed->lengthAllocDescs) != epos->offset - sizeof(struct allocExtDesc)
WARNING: fs/udf/inode.c:2085 at __udf_add_aext+0x524/0x6d0 fs/udf/inode.c:2084, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 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:2084
Code: 14 dc fe 49 8b 3e 4c 89 e6 e8 f8 11 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 1d 39 70 fe 90 <0f> 0b 90 e9 14 fc ff ff e8 0f 39 70 fe 90 0f 0b 90 e9 66 fd ff ff
RSP: 0018:ffffc9000efbf180 EFLAGS: 00010293
RAX: ffffffff83558573 RBX: dffffc0000000000 RCX: ffff88801abf24c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff92001df7eb5 R08: ffff88801abf24c0 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffc9000efbf5a0 R15: ffffc9000efbf5a8
FS:  00007fb7bdae96c0(0000) GS:ffff88808ca4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7bdae8fe8 CR3: 0000000012b20000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_add_aext fs/udf/inode.c:2142 [inline]
 udf_do_extend_file+0x90c/0x11e0 fs/udf/inode.c:588
 inode_getblk fs/udf/inode.c:840 [inline]
 udf_map_block+0xfff/0x4330 fs/udf/inode.c:451
 __udf_get_block+0x52/0x250 fs/udf/inode.c:465
 __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:259
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319
 udf_file_write_iter+0x2ca/0x6b0 fs/udf/file.c:112
 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
 vfs_writev+0x33c/0x990 fs/read_write.c:1059
 do_pwritev fs/read_write.c:1155 [inline]
 __do_sys_pwritev2 fs/read_write.c:1213 [inline]
 __se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
 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: 0033:0x7fb7bcb9c819
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:00007fb7bdae8fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fb7bce16180 RCX: 00007fb7bcb9c819
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007fb7bcc32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7bce16218 R14: 00007fb7bce16180 R15: 00007ffe66029c38
 </TASK>