------------[ cut here ]------------
le32_to_cpu(aed->lengthAllocDescs) != epos->offset - sizeof(struct allocExtDesc)
WARNING: fs/udf/inode.c:2087 at __udf_add_aext+0x684/0x7f0 fs/udf/inode.c:2087, CPU#0: syz.2.411/8174
Modules linked in:
CPU: 0 UID: 0 PID: 8174 Comm: syz.2.411 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__udf_add_aext+0x684/0x7f0 fs/udf/inode.c:2087
Code: 6f fe 48 8b 7c 24 08 be 18 00 00 00 e8 a5 bb 02 00 e9 31 fe ff ff e8 fb 3d 6f fe 90 0f 0b 90 e9 a7 fb ff ff e8 ed 3d 6f fe 90 <0f> 0b 90 e9 2a fb ff ff bb fb ff ff ff e9 38 fe ff ff e8 e5 d5 da
RSP: 0018:ffffc90005c27038 EFLAGS: 00010287
RAX: 0000000000003741 RBX: ffffc90005c27418 RCX: ffffc9001126a000
RDX: 0000000000080000 RSI: ffffffff83998233 RDI: ffff88807a081e80
RBP: ffff88806deb8158 R08: 0000000000000006 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000010 R14: 0000000000000018 R15: ffffc90005c27420
FS:  00007f40b0bb36c0(0000) GS:ffff88812433f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34215ff8 CR3: 00000000227cc000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 udf_add_aext+0x23a/0x2e0 fs/udf/inode.c:2145
 udf_do_extend_file+0x3cf/0x8a0 fs/udf/inode.c:591
 inode_getblk+0x11a4/0x41f0 fs/udf/inode.c:843
 udf_map_block+0x2dd/0x5c0 fs/udf/inode.c:454
 __udf_get_block+0x98/0x330 fs/udf/inode.c:468
 __block_write_begin_int+0x57a/0x19c0 fs/buffer.c:2142
 block_write_begin+0x9d/0x1d0 fs/buffer.c:2253
 udf_write_begin+0x217/0x300 fs/udf/inode.c:262
 generic_perform_write+0x292/0xa40 mm/filemap.c:4319
 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4436
 udf_file_write_iter+0x231/0x780 fs/udf/file.c:112
 do_iter_readv_writev+0x6ee/0x920 fs/read_write.c:829
 vfs_writev+0x360/0xe10 fs/read_write.c:1059
 do_pwritev+0x1ac/0x270 fs/read_write.c:1155
 __do_sys_pwritev2 fs/read_write.c:1213 [inline]
 __se_sys_pwritev2 fs/read_write.c:1204 [inline]
 __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40afd9c799
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:00007f40b0bb3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f40b0016090 RCX: 00007f40afd9c799
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f40afe32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000
R13: 00007f40b0016128 R14: 00007f40b0016090 R15: 00007fff04da5d68
 </TASK>