linux-kernel - [ 048/173] ext4: fix memory leak in ext4_xattr_set

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Message-Id: <20121228190340.049820428@decadent.org.uk>
Date:	Fri, 28 Dec 2012 20:04:18 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Eugene Shatokhin <eugene.shatokhin@...alab.ru>,
	Lukas Czerner <lczerner@...hat.com>,
	"Theodore Tso" <tytso@....edu>
Subject: [ 048/173] ext4: fix memory leak in ext4_xattr_set_acl()s error path

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

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

From: Eugene Shatokhin <eugene.shatokhin@...alab.ru>

commit 24ec19b0ae83a385ad9c55520716da671274b96c upstream.

In ext4_xattr_set_acl(), if ext4_journal_start() returns an error,
posix_acl_release() will not be called for 'acl' which may result in a
memory leak.

This patch fixes that.

Reviewed-by: Lukas Czerner <lczerner@...hat.com>
Signed-off-by: Eugene Shatokhin <eugene.shatokhin@...alab.ru>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/ext4/acl.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index d3c5b88..e6e0d98 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -423,8 +423,10 @@ ext4_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
 
 retry:
 	handle = ext4_journal_start(inode, EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
-	if (IS_ERR(handle))
-		return PTR_ERR(handle);
+	if (IS_ERR(handle)) {
+		error = PTR_ERR(handle);
+		goto release_and_out;
+	}
 	error = ext4_set_acl(handle, inode, type, acl);
 	ext4_journal_stop(handle);
 	if (error == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))


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