linux-kernel - [PATCH 5/7] ext4 resize: lost brelse() in update

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Date:   Mon, 29 Oct 2018 18:25:28 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] ext4 resize: lost brelse() in update_backups()

bh was not released after error in ext4_journal_get_write_access()

Fixes ac27a0ec112a ("ext4: initial copy of files from ext3")
#? cc: stable <stable@...r.kernel.org>     # 2.6.19 or even earlier in ext3

Signed-off-by: Vasily Averin <vvs@...nvz.org>
---
 fs/ext4/resize.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index ff8389ac4769..26bcb53e5869 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1122,8 +1122,10 @@ static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
 			   backup_block, backup_block -
 			   ext4_group_first_block_no(sb, group));
 		BUFFER_TRACE(bh, "get_write_access");
-		if ((err = ext4_journal_get_write_access(handle, bh)))
+		if ((err = ext4_journal_get_write_access(handle, bh))) {
+			brelse(bh);
 			break;
+		}
 		lock_buffer(bh);
 		memcpy(bh->b_data, data, size);
 		if (rest)
-- 
2.17.1