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From:   Vasily Averin <vvs@virtuozzo.com>
Subject: [PATCH 5/7] ext4 resize: lost brelse() in update_backups()
To:     linux-ext4@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>
Cc:     Andreas Dilger <adilger.kernel@dilger.ca>,
        linux-kernel@vger.kernel.org
Message-ID: <f55088b4-5696-55ed-0190-5848e3403007@virtuozzo.com>
Date:   Mon, 29 Oct 2018 18:25:28 +0300
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bh was not released after error in ext4_journal_get_write_access()

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

Signed-off-by: Vasily Averin <vvs@openvz.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