syzbot

loop0: detected capacity change from 0 to 2048
UDF-fs: INFO Mounting volume 'LiuxUDF', timestamp 2022/11/22 14:59 (1000)
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le32_to_cpu(aed->lengthAllocDescs) != epos->offset - sizeof(struct allocExtDesc)
WARNING: fs/udf/inode.c:2084 at __udf_add_aext+0x684/0x7f0 fs/udf/inode.c:2084, CPU#0: syz.0.17/6029
Modules linked in:
CPU: 0 UID: 0 PID: 6029 Comm: syz.0.17 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:2084
Code: 6f fe 48 8b 7c 24 08 be 18 00 00 00 e8 a5 bb 02 00 e9 31 fe ff ff e8 5b 2f 6f fe 90 0f 0b 90 e9 a7 fb ff ff e8 4d 2f 6f fe 90 <0f> 0b 90 e9 2a fb ff ff bb fb ff ff ff e9 38 fe ff ff e8 45 c9 da
RSP: 0018:ffffc900031a70f0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc900031a7608 RCX: ffffffff8399a7d3
RDX: ffff888032595b80 RSI: ffffffff8399acb3 RDI: ffff888032595b80
RBP: ffff88805f64ba28 R08: 0000000000000006 R09: 0000000000000000
R10: 00000000000001e0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000008 R14: 00000000000001f8 R15: ffffc900031a7610
FS:  000055555cbd8500(0000) GS:ffff888124339000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31463fff CR3: 0000000037fec000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 udf_setup_indirect_aext+0x656/0xa20 fs/udf/inode.c:2047
 udf_add_aext+0x207/0x2e0 fs/udf/inode.c:2137
 udf_do_extend_file+0x3cf/0x8a0 fs/udf/inode.c:588
 inode_getblk+0x11a4/0x41f0 fs/udf/inode.c:840
 udf_map_block+0x2dd/0x5c0 fs/udf/inode.c:451
 __udf_get_block+0x98/0x330 fs/udf/inode.c:465
 __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:259
 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
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:800
 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: 0033:0x7fd0bff9c819
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:00007ffe98df7528 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fd0c0215fa0 RCX: 00007fd0bff9c819
RDX: 0000000000000001 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007fd0c0032c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000010000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd0c0215fac R14: 00007fd0c0215fa0 R15: 00007fd0c0215fa0
 </TASK>