linux-kernel - [syzbot] general protection fault in d_flags_for

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Date:   Sat, 24 Sep 2022 20:17:31 -0700
From:   syzbot <syzbot+2f012b85ac8ce9be92e5@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] general protection fault in d_flags_for_inode

Hello,

syzbot found the following issue on:

HEAD commit:    1a61b828566f Merge tag 'char-misc-6.0-rc7' of git://git.ke..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=125f60d4880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=122d7bd4fc8e0ecb
dashboard link: https://syzkaller.appspot.com/bug?extid=2f012b85ac8ce9be92e5
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=13153c4c880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=156e2650880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/367e34e7ff83/disk-1a61b828.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/91a2819fe451/vmlinux-1a61b828.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2f012b85ac8ce9be92e5@...kaller.appspotmail.com

ntfs3: loop0: Different NTFS' sector size (2048) and media sector size (512)
ntfs3: loop0: RAW NTFS volume: Filesystem size 0.00 Gb > volume size 0.00 Gb. Mount in read-only
ntfs3: loop0: Failed to load $Extend.
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3605 Comm: syz-executor204 Not tainted 6.0.0-rc6-syzkaller-00309-g1a61b828566f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:d_flags_for_inode+0x21b/0x2a0 fs/dcache.c:1980
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 69 49 83 7c 24 08 00 75 34 e8 82 95 9f ff 41 83 cd
RSP: 0018:ffffc900039afb40 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff888072cad370 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff81dc7352 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000008 R14: ffff8880700a0000 R15: ffff888020d02088
FS:  0000555556e83300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd13507000 CR3: 000000007498a000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 __d_instantiate+0x21/0x450 fs/dcache.c:1998
 d_instantiate fs/dcache.c:2036 [inline]
 d_instantiate fs/dcache.c:2030 [inline]
 d_make_root+0xae/0x110 fs/dcache.c:2071
 ntfs_fill_super+0x31eb/0x37f0 fs/ntfs3/super.c:1269
 get_tree_bdev+0x440/0x760 fs/super.c:1323
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 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: 0033:0x7fa9945b147a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 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:00007ffd13506ac8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd13506b20 RCX: 00007fa9945b147a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd13506ae0
RBP: 00007ffd13506ae0 R08: 00007ffd13506b20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020000320
R13: 0000000000000003 R14: 0000000000000004 R15: 000000000000000c
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_flags_for_inode+0x21b/0x2a0 fs/dcache.c:1980
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 69 49 83 7c 24 08 00 75 34 e8 82 95 9f ff 41 83 cd
RSP: 0018:ffffc900039afb40 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff888072cad370 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff81dc7352 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000008 R14: ffff8880700a0000 R15: ffff888020d02088
FS:  0000555556e83300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd13507000 CR3: 000000007498a000 CR4: 0000000000350ee0
----------------
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 90 00 00 00    	jne    0xa0
  10:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  17:	fc ff df
  1a:	4c 8b 63 20          	mov    0x20(%rbx),%r12
  1e:	49 8d 7c 24 08       	lea    0x8(%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:	75 69                	jne    0x99
  30:	49 83 7c 24 08 00    	cmpq   $0x0,0x8(%r12)
  36:	75 34                	jne    0x6c
  38:	e8 82 95 9f ff       	callq  0xff9f95bf
  3d:	41                   	rex.B
  3e:	83                   	.byte 0x83
  3f:	cd                   	.byte 0xcd


---
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