linux-kernel - [PATCH 4.14 079/124] ext4: avoid buffer leak on shutdown in ext4_mark_iloc

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Message-Id: <20181119162628.218495247@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:28:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vasily Averin <vvs@...tuozzo.com>,
        Theodore Tso <tytso@....edu>, stable@...nel.org
Subject: [PATCH 4.14 079/124] ext4: avoid buffer leak on shutdown in ext4_mark_iloc_dirty()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vasily Averin <vvs@...tuozzo.com>

commit a6758309a005060b8297a538a457c88699cb2520 upstream.

ext4_mark_iloc_dirty() callers expect that it releases iloc->bh
even if it returns an error.

Fixes: 0db1ff222d40 ("ext4: add shutdown bit and check for it")
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org # 4.11
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/inode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5671,9 +5671,10 @@ int ext4_mark_iloc_dirty(handle_t *handl
 {
 	int err = 0;
 
-	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) {
+		put_bh(iloc->bh);
 		return -EIO;
-
+	}
 	if (IS_I_VERSION(inode))
 		inode_inc_iversion(inode);