[syzbot] [ntfs3?] general protection fault in ni_readpage_cmpr

syzbot
2023-04-11T09:05:41Z

Hello,

syzbot found the following issue on:

HEAD commit: aa318c48808c Merge tag 'gpio-fixes-for-v6.3-rc6' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10496611c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=adfc55aec6afccdd
dashboard link: https://syzkaller.appspot.com/bug?extid=af224b63e76b2d869bc3
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/3f2cda6aed35/disk-aa318c48.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b3abc5d6e123/vmlinux-aa318c48.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5e21f7b0c192/bzImage-aa318c48.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+af224b63e76b2d869bc3@syzkaller.appspotmail.com

RBP: 00007f5102ac71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd8c6b1d4f R14: 00007f5102ac7300 R15: 0000000000022000
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 21645 Comm: syz-executor.1 Not tainted 6.3.0-rc5-syzkaller-00153-gaa318c48808c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
RIP: 0010:_compound_head include/linux/page-flags.h:251 [inline]
RIP: 0010:unlock_page+0x25/0x130 mm/folio-compat.c:21
Code: 00 00 00 00 00 f3 0f 1e fa 41 54 55 48 89 fd 53 e8 c0 24 d2 ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e4 00 00 00 4c 8b 65 08 31 ff 4c 89 e3 83 e3 01
RSP: 0018:ffffc900047e7520 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000008 RCX: ffffc90003b51000
RDX: 0000000000000001 RSI: ffffffff81afd3b0 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801e052988 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f5102ac7700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5102ac8000 CR3: 000000007c8da000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ni_readpage_cmpr+0x44a/0xcd0 fs/ntfs3/frecord.c:2149
ntfs_read_folio+0x101/0x1e0 fs/ntfs3/inode.c:703
filemap_read_folio+0xdb/0x2c0 mm/filemap.c:2424
filemap_create_folio mm/filemap.c:2552 [inline]
filemap_get_pages+0x42a/0x1620 mm/filemap.c:2605
filemap_read+0x35e/0xc70 mm/filemap.c:2693
generic_file_read_iter+0x3ad/0x5b0 mm/filemap.c:2840
ntfs_file_read_iter+0x1b8/0x270 fs/ntfs3/file.c:758
call_read_iter include/linux/fs.h:1845 [inline]
generic_file_splice_read+0x182/0x4b0 fs/splice.c:402
do_splice_to+0x1b9/0x240 fs/splice.c:885
splice_direct_to_actor+0x2ab/0x8a0 fs/splice.c:956
do_splice_direct+0x1ab/0x280 fs/splice.c:1065
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
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: 0033:0x7f5101c8c169
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:00007f5102ac7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f5101dabf80 RCX: 00007f5101c8c169
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f5102ac71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd8c6b1d4f R14: 00007f5102ac7300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_compound_head include/linux/page-flags.h:251 [inline]
RIP: 0010:unlock_page+0x25/0x130 mm/folio-compat.c:21
Code: 00 00 00 00 00 f3 0f 1e fa 41 54 55 48 89 fd 53 e8 c0 24 d2 ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e4 00 00 00 4c 8b 65 08 31 ff 4c 89 e3 83 e3 01
RSP: 0018:ffffc900047e7520 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000008 RCX: ffffc90003b51000
RDX: 0000000000000001 RSI: ffffffff81afd3b0 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801e052988 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f5102ac7700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5102ac8000 CR3: 000000007c8da000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 f3 add %dh,%bl
6: 0f 1e fa nop %edx
9: 41 54 push %r12
b: 55 push %rbp
c: 48 89 fd mov %rdi,%rbp
f: 53 push %rbx
10: e8 c0 24 d2 ff callq 0xffd224d5
15: 48 8d 7d 08 lea 0x8(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
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 e4 00 00 00 jne 0x118
34: 4c 8b 65 08 mov 0x8(%rbp),%r12
38: 31 ff xor %edi,%edi
3a: 4c 89 e3 mov %r12,%rbx
3d: 83 e3 01 and $0x1,%ebx

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