linux-ext4 - [PATCH] jbd2: add the missing unlock_buffer() in the error path of jbd2_write

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Date:   Sat, 20 Jun 2020 14:19:48 +0800
From:   "zhangyi (F)" <yi.zhang@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <tytso@....edu>, <jack@...e.cz>, <yi.zhang@...wei.com>,
        <jiufei.xue@...ux.alibaba.com>
Subject: [PATCH] jbd2: add the missing unlock_buffer() in the error path of jbd2_write_superblock()

jbd2_write_superblock() is under the buffer lock of journal superblock
before ending that superblock write, so add a missing unlock_buffer() in
in the error path before submitting buffer.

Fixes: 742b06b5628f ("jbd2: check superblock mapped prior to committing")
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
Cc: stable@...nel.org
---
 fs/jbd2/journal.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index a49d0e670ddf..55c4ec4edf96 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1366,8 +1366,10 @@ static int jbd2_write_superblock(journal_t *journal, int write_flags)
 	int ret;
 
 	/* Buffer got discarded which means block device got invalidated */
-	if (!buffer_mapped(bh))
+	if (!buffer_mapped(bh)) {
+		unlock_buffer(bh);
 		return -EIO;
+	}
 
 	trace_jbd2_write_superblock(journal, write_flags);
 	if (!(journal->j_flags & JBD2_BARRIER))
-- 
2.25.4