4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> commit 33b525cef4cff49e216e4133cc48452e11c0391e upstream. When doing cleanup, if flags without OCFS2_BH_READAHEAD, it may trigger NULL pointer dereference in the following ocfs2_set_buffer_uptodate() if bh is NULL. Link: https://lkml.kernel.org/r/20240902023636.1843422-3-joseph.qi@xxxxxxxxxxxxxxxxx Fixes: cf76c78595ca ("ocfs2: don't put and assigning null to bh allocated outside") Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> Signed-off-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx> Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx> Reported-by: Heming Zhao <heming.zhao@xxxxxxxx> Suggested-by: Heming Zhao <heming.zhao@xxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [4.20+] Cc: Changwei Ge <gechangwei@xxxxxxx> Cc: Gang He <ghe@xxxxxxxx> Cc: Joel Becker <jlbec@xxxxxxxxxxxx> Cc: Jun Piao <piaojun@xxxxxxxxxx> Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx> Cc: Mark Fasheh <mark@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ocfs2/buffer_head_io.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/ocfs2/buffer_head_io.c +++ b/fs/ocfs2/buffer_head_io.c @@ -404,7 +404,8 @@ read_failure: /* Always set the buffer in the cache, even if it was * a forced read, or read-ahead which hasn't yet * completed. */ - ocfs2_set_buffer_uptodate(ci, bh); + if (bh) + ocfs2_set_buffer_uptodate(ci, bh); } ocfs2_metadata_cache_io_unlock(ci);
