jbd2: avoid memleak in jbd2_journal_write_metadata_buffer

The new_bh is from alloc_buffer_head, we should call free_buffer_head to
free it in error case.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20240514112438.1269037-2-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 03c4b9214f564a311bd1dd028abe2a7fb6aa2ee1..5ad255ffb289c78ec232d198ad404eed08bd33f6 100644 (file)
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -399,6 +399,7 @@ repeat:
                tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS);
                if (!tmp) {
                        brelse(new_bh);
+                       free_buffer_head(new_bh);
                        return -ENOMEM;
                }
                spin_lock(&jh_in->b_state_lock);