Re: [syzbot] [jfs?] general protection fault in diRead (2)

[syzbot <syzbot+8f731999dc47797f064f@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    e0b668b07034 Merge tag 'kbuild-fixes-v6.10-3' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1410f701980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=67463c0717b8d4ca
dashboard link: https://syzkaller.appspot.com/bug?extid=8f731999dc47797f064f
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16746281980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed13da6c8dba/disk-e0b668b0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9d6deb7033b3/vmlinux-e0b668b0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e11ed9921d74/bzImage-e0b668b0.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/eb462546ac65/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/99f39780fc30/mount_3.gz
mounted in repro #3: https://storage.googleapis.com/syzbot-assets/04d3c406f9d9/mount_12.gz
mounted in repro #4: https://storage.googleapis.com/syzbot-assets/7c2f2b18cf02/mount_19.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f731999dc47797f064f@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827]
CPU: 0 PID: 6386 Comm: syz-executor Not tainted 6.10.0-rc5-syzkaller-00348-ge0b668b07034 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 e9 56 d8 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 c9 56 d8 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc90004d17758 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff888068d716b0 R08: ffff888068d71357 R09: 1ffff1100d1ae26a
R10: dffffc0000000000 R11: ffffed100d1ae26b R12: 0000000000000006
R13: 0000000000000000 R14: ffff888068d71348 R15: dffffc0000000000
FS:  00005555954e3500(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555595506608 CR3: 000000002bd0e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_iget+0x8c/0x3b0 fs/jfs/inode.c:35
 jfs_lookup+0x226/0x410 fs/jfs/namei.c:1469
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1692
 lookup_slow+0x53/0x70 fs/namei.c:1709
 walk_component+0x2e1/0x410 fs/namei.c:2004
 lookup_last fs/namei.c:2469 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2493
 filename_lookup+0x256/0x610 fs/namei.c:2522
 user_path_at_empty+0x42/0x60 fs/namei.c:2929
 user_path_at include/linux/namei.h:58 [inline]
 ksys_umount fs/namespace.c:1916 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __x64_sys_umount+0xf4/0x170 fs/namespace.c:1922
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ce4976ec7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffda0a75a88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f6ce49e364a RCX: 00007f6ce4976ec7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffda0a75b40
RBP: 00007ffda0a75b40 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffda0a76c30
R13: 00007f6ce49e364a R14: 0000000000064c17 R15: 00007ffda0a77d20
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 e9 56 d8 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 c9 56 d8 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc90004d17758 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff888068d716b0 R08: ffff888068d71357 R09: 1ffff1100d1ae26a
R10: dffffc0000000000 R11: ffffed100d1ae26b R12: 0000000000000006
R13: 0000000000000000 R14: ffff888068d71348 R15: dffffc0000000000
FS:  00005555954e3500(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00272b000 CR3: 000000002bd0e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 5d 80             	lea    -0x80(%rbp),%ebx
   3:	48 89 d8             	mov    %rbx,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 e9 56 d8 fe       	call   0xfed85702
  19:	4c 8b 2b             	mov    (%rbx),%r13
  1c:	49 8d 9d 20 08 00 00 	lea    0x820(%r13),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 c9 56 d8 fe       	call   0xfed85702
  39:	4c 8b 3b             	mov    (%rbx),%r15
  3c:	49 8d 5f 28          	lea    0x28(%r15),%rbx


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