[Cluster-devel] GFS2: Fix very unlikley memory leak in ACL xattr code

[Steven Whitehouse]

>From 114b80ce2c05f91f10fffbf303080357d73c0675 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho at redhat.com>
Date: Wed, 9 Nov 2011 12:54:43 +0000
Subject: [PATCH 1/2] GFS2: Fix very unlikley memory leak in ACL xattr code

This was spotted by automated code analysis. In case reading
an ACL xattr failed (only likely to happen if there is an I/O
error for example, and even then only with unstuffed xattrs,
so pretty difficult to trigger) a small amount of memory could
potentially be leaked.

This patch adds a kfree to the error path, and also removes a
test which is no longer required (gfs2_ea_get_copy always
returns either a negative error, or a length)

Signed-off-by: Steven Whitehouse <swhiteho at redhat.com>
---
 fs/gfs2/xattr.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index 71d7bf8..a201a1d 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -549,9 +549,10 @@ int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 		goto out;
 
 	error = gfs2_ea_get_copy(ip, &el, data, len);
-	if (error == 0)
-		error = len;
-	*ppdata = data;
+	if (error < 0)
+		kfree(data);
+	else
+		*ppdata = data;
 out:
 	brelse(el.el_bh);
 	return error;
-- 
1.7.4