Re: [syzbot] WARNING in __udf_add_aext

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    aaa11ce2ffc8 Add linux-next specific files for 20220923
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10ba92a4880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
dashboard link: https://syzkaller.appspot.com/bug?extid=0eaad3590d65102b9391
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114c4c0c880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1664e478880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/95c7bf83c07e/disk-aaa11ce2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b161cd56a7a3/vmlinux-aaa11ce2.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0aa83cf49b7b/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0eaad3590d65102b9391@xxxxxxxxxxxxxxxxxxxxxxxxx

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WARNING: CPU: 0 PID: 3662 at fs/udf/inode.c:2017 __udf_add_aext+0x676/0x7d0 fs/udf/inode.c:2017
Modules linked in:
CPU: 0 PID: 3662 Comm: syz-executor182 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:__udf_add_aext+0x676/0x7d0 fs/udf/inode.c:2017
Code: ef 0f 84 b3 fb ff ff e8 68 cc a7 fe 0f 0b e9 a7 fb ff ff e8 5c cc a7 fe 48 8b 44 24 20 48 05 b0 00 00 00 eb b7 e8 4a cc a7 fe <0f> 0b e9 27 fb ff ff e8 3e cc a7 fe 0f 0b e9 7d fb ff ff 41 bc fb
RSP: 0018:ffffc90003d7f378 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc90003d7f800 RCX: 0000000000000000
RDX: ffff88801f218000 RSI: ffffffff82d4c7b6 RDI: 0000000000000006
RBP: ffff8880749ddb08 R08: 0000000000000006 R09: 0000000000000000
R10: 00000000000001d0 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001d0 R14: 0000000000000010 R15: 00000000000001e8
FS:  0000555556794300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce22d305e0 CR3: 000000002276a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udf_setup_indirect_aext+0x576/0x880 fs/udf/inode.c:1983
 udf_add_aext+0x208/0x2d0 fs/udf/inode.c:2070
 udf_insert_aext fs/udf/inode.c:2236 [inline]
 udf_update_extents fs/udf/inode.c:1190 [inline]
 inode_getblk+0x22db/0x4010 fs/udf/inode.c:894
 udf_get_block.part.0+0x1c7/0x4e0 fs/udf/inode.c:443
 udf_get_block+0x36/0x210 fs/udf/inode.c:425
 __block_write_begin_int+0x3b9/0x14b0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0xb5/0x4d0 fs/buffer.c:2102
 udf_write_begin+0x31/0xa0 fs/udf/inode.c:212
 generic_perform_write+0x252/0x570 mm/filemap.c:3753
 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3881
 udf_file_write_iter+0x2cc/0x650 fs/udf/file.c:170
 call_write_iter include/linux/fs.h:2190 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:578
 ksys_write+0x127/0x250 fs/read_write.c:631
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fce22d5ba59
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc3f3136e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 00007fce22d5ba59
RDX: 000000000000fea7 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc3f313710 R09: 00007ffc3f313710
R10: 00007ffc3f3135b0 R11: 0000000000000246 R12: 00007ffc3f31370c
R13: 00007ffc3f313740 R14: 00007ffc3f313720 R15: 0000000000000005
 </TASK>