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Subject[syzbot] [reiserfs?] general protection fault in direct2indirect
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Hello,

syzbot found the following issue on:

HEAD commit: 1b929c02afd3 Linux 6.2-rc1
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13690f08480000
kernel config: https://syzkaller.appspot.com/x/.config?x=68e0be42c8ee4bb4
dashboard link: https://syzkaller.appspot.com/bug?extid=e69a9406662c63f12e24
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=112c5f40480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1360b86c480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2d8c5072480f/disk-1b929c02.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/46687f1395db/vmlinux-1b929c02.xz
kernel image: https://storage.googleapis.com/syzbot-assets/26f1afa5ec00/bzImage-1b929c02.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3ddbc376b1d3/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e69a9406662c63f12e24@syzkaller.appspotmail.com

REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 549. Fsck?
REISERFS (device loop0): Remounting filesystem read-only
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 5068 Comm: syz-executor435 Not tainted 6.2.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x916/0x17c0 fs/reiserfs/tail_conversion.c:119
Code: 48 8b 04 24 4a 8d 5c 38 10 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 43 03 00 00 48 63 1b 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 8c 8a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003c7f100 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffff888021c93a80
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003c7f270 R08: ffffffff822ef83e R09: ffffffff822e1c5d
R10: 0000000000000002 R11: ffff888021c93a80 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000028 R15: 0000000000000010
FS: 0000555555b8a3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000208 CR3: 000000002a8a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
reiserfs_get_block+0x4c9a/0x5180 fs/reiserfs/inode.c:949
__block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775
generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772
__generic_file_write_iter+0x176/0x400 mm/filemap.c:3900
generic_file_write_iter+0xab/0x310 mm/filemap.c:3932
call_write_iter include/linux/fs.h:2186 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7dc/0xc50 fs/read_write.c:584
ksys_write+0x177/0x2a0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f709ad71ed9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd885a00d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd885a00e8 RCX: 00007f709ad71ed9
RDX: 00000000175d900f RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007ffd885a00e0 R08: 00007ffd885a00e0 R09: 00007f709ad2f490
R10: 00007ffd885a00e0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x916/0x17c0 fs/reiserfs/tail_conversion.c:119
Code: 48 8b 04 24 4a 8d 5c 38 10 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 43 03 00 00 48 63 1b 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 8c 8a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003c7f100 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffff888021c93a80
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003c7f270 R08: ffffffff822ef83e R09: ffffffff822e1c5d
R10: 0000000000000002 R11: ffff888021c93a80 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000028 R15: 0000000000000010
FS: 0000555555b8a3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000208 CR3: 000000002a8a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 8b 04 24 mov (%rsp),%rax
4: 4a 8d 5c 38 10 lea 0x10(%rax,%r15,1),%rbx
9: 48 89 d8 mov %rbx,%rax
c: 48 c1 e8 03 shr $0x3,%rax
10: 0f b6 04 10 movzbl (%rax,%rdx,1),%eax
14: 84 c0 test %al,%al
16: 0f 85 43 03 00 00 jne 0x35f
1c: 48 63 1b movslq (%rbx),%rbx
1f: 49 83 c6 28 add $0x28,%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction
2e: 74 12 je 0x42
30: 4c 89 f7 mov %r14,%rdi
33: e8 8c 8a b2 ff callq 0xffb28ac4
38: 48 rex.W
39: ba 00 00 00 00 mov $0x0,%edx
3e: 00 fc add %bh,%ah


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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