[BUG] kernel BUG in ocfs2_recover_node

[BUG] kernel BUG in ocfs2_recover_node

[l1za0.sec]

From: Haocheng Yu <l1za0.sec@gmail.com>

Hi,

We found a kernel BUG in ocfs2_recover_node() while fuzzing Linux with a
modified version of syzkaller. We couldn't find a report of the same issue on
syzbot. We are investigating the root cause and trying to develop a fix. Could
you let us know whether this issue warrants a fix?

The crash occurs on Linux v7.3.0-rc5. The kernel hits the BUG at 
fs/ocfs2/journal.c:1838 from the OCFS2 recovery thread and terminates with an 
invalid-opcode Oops.

Relevant stack trace:

  ocfs2_recover_node (fs/ocfs2/journal.c:1838)
  __ocfs2_recovery_thread (fs/ocfs2/journal.c:1547)
  kthread (kernel/kthread.c:436)
  ret_from_fork (arch/x86/kernel/process.c:158)
  ret_from_fork_asm (arch/x86/entry/entry_64.S:245)

The reproducer mounts a crafted OCFS2 image with the nouser_xattr,
heartbeat=none, and commit mount options. The crash then occurs asynchronously
in the OCFS2 recovery thread.

Full reproducer:
syz_mount_image$ocfs2(&(0x7f0000004500), &(0x7f0000004540)='./file0\x00', 0x2, &(0x7f00000004c0)={[{@nouser_xattr}, {@heartbeat_none}, {@commit}]}, 0x1, 0x4503, &(0x7f0000004580)="$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Best regards,
Haocheng Yu