In the Linux kernel, the following vulnerability has been resolved:

ocfs2: fix null-ptr-deref when journal load failed.

During the mounting process, if journal_reset() fails because of too short
journal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. 
Subsequently, ocfs2_journal_shutdown() calls
jbd2_journal_flush()->jbd2_cleanup_journal_tail()->
__jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail()
->lock_buffer(journal->j_sb_buffer), resulting in a null-pointer
dereference error.

To resolve this issue, we should check the JBD2_LOADED flag to ensure the
journal was properly loaded.  Additionally, use journal instead of
osb->journal directly to simplify the code.

kernel.org https://git.kernel.org/stable/c/387bf565cc03e2e8c720b8b4798efea4aacb6962 [No types assigned]

kernel.org https://git.kernel.org/stable/c/5784d9fcfd43bd853654bb80c87ef293b9e8e80a [No types assigned]

kernel.org https://git.kernel.org/stable/c/82dfdd1e31e774578f76ce6dc90c834f96403a0f [No types assigned]

kernel.org https://git.kernel.org/stable/c/86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b [No types assigned]

kernel.org https://git.kernel.org/stable/c/bf605ae98dab5c15c5b631d4d7f88898cb41b649 [No types assigned]

kernel.org https://git.kernel.org/stable/c/f60e94a83db799bde625ac8671a5b4a6354e7120 [No types assigned]

kernel.org https://git.kernel.org/stable/c/ff55291fb36779819211b596da703389135f5b05 [No types assigned]