ocfs2: fix memory leak in ocfs2_merge_rec_left()

In 'ocfs2_merge_rec_left()', do not reset 'left_path' to NULL after
move, thus allowing 'ocfs2_free_path()' to free it before return.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 677b975 ("ocfs2: Add support for cross extent block")
Signed-off-by: Dmitry Antipov <[email protected]>
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=cfc7cab3bb6eaa7c4de2
Reviewed-by: Heming Zhao <[email protected]>
Acked-by: Joseph Qi <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Changwei Ge <[email protected]>
Cc: Jun Piao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: dmantipov

fs/ocfs2/alloc.c

@@ -3655,7 +3655,6 @@ static int ocfs2_merge_rec_left(struct ocfs2_path *right_path,
 			 * So we use the new rightmost path.
 			 */
 			ocfs2_mv_path(right_path, left_path);
-			left_path = NULL;
 		} else
 			ocfs2_complete_edge_insert(handle, left_path,
 						   right_path, subtree_index);