[syzbot] [udf?] general protection fault in udf_fiiter_write_fi

syzbot
2023-01-09T06:31:48Z

Hello,

syzbot found the following issue on:

HEAD commit: c76083fac3ba Add linux-next specific files for 20221226
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13ce8194480000
kernel config: https://syzkaller.appspot.com/x/.config?x=c217c755f1884ab6
dashboard link: https://syzkaller.appspot.com/bug?extid=aebf90eea2671c43112a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e388f26357fd/disk-c76083fa.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e24f0bae36d5/vmlinux-c76083fa.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a5a69a059716/bzImage-c76083fa.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aebf90eea2671c43112a@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 13485 Comm: syz-executor.3 Not tainted 6.2.0-rc1-next-20221226-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:udf_fiiter_write_fi+0x14e/0x9d0 fs/udf/directory.c:402
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1b 08 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 10 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ed 07 00 00 49 8b 44 24 28 48 8d 7b 18 48 89 fa
RSP: 0018:ffffc9000b327818 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffc9000b327ad0 RCX: ffffc9000cd16000
RDX: 0000000000000005 RSI: ffffffff82df7ad5 RDI: 0000000000000028
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888082c31af8 R14: ffffc9000b327ad0 R15: ffff888082c30158
FS: 00007ff99c5ae700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020045000 CR3: 0000000078396000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
udf_rename+0x69d/0xb80 fs/udf/namei.c:870
vfs_rename+0x1162/0x1a90 fs/namei.c:4779
do_renameat2+0xb22/0xc30 fs/namei.c:4930
__do_sys_rename fs/namei.c:4976 [inline]
__se_sys_rename fs/namei.c:4974 [inline]
__x64_sys_rename+0x81/0xa0 fs/namei.c:4974
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff99b88c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff99c5ae168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007ff99b9ac050 RCX: 00007ff99b88c0c9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000020000040
RBP: 00007ff99b8e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdfd6d93ef R14: 00007ff99c5ae300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:udf_fiiter_write_fi+0x14e/0x9d0 fs/udf/directory.c:402
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1b 08 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 10 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ed 07 00 00 49 8b 44 24 28 48 8d 7b 18 48 89 fa
RSP: 0018:ffffc9000b327818 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffc9000b327ad0 RCX: ffffc9000cd16000
RDX: 0000000000000005 RSI: ffffffff82df7ad5 RDI: 0000000000000028
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888082c31af8 R14: ffffc9000b327ad0 R15: ffff888082c30158
FS: 00007ff99c5ae700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3303f000 CR3: 0000000078396000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 89 fa mov %edi,%edx
2: 48 c1 ea 03 shr $0x3,%rdx
6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
a: 0f 85 1b 08 00 00 jne 0x82b
10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
17: fc ff df
1a: 4c 8b 63 10 mov 0x10(%rbx),%r12
1e: 49 8d 7c 24 28 lea 0x28(%r12),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 ed 07 00 00 jne 0x821
34: 49 8b 44 24 28 mov 0x28(%r12),%rax
39: 48 8d 7b 18 lea 0x18(%rbx),%rdi
3d: 48 89 fa mov %rdi,%rdx

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