linux-kernel - ext4: fix memory leak in xattr code.

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Message-ID: <20130920142918.GA21988@redhat.com>
Date:	Fri, 20 Sep 2013 10:29:18 -0400
From:	Dave Jones <davej@...hat.com>
To:	tytso@....edu
Cc:	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: ext4: fix memory leak in xattr code.

If we take the 2nd retry path in ext4_expand_extra_isize_ea, we potentionally
return from the function without having freed these allocations.
If we don't do the return, we over-write the previous allocation pointers, 
so we leak either way.

Spotted with Coverity.

Signed-off-by: Dave Jones <davej@...oraproject.org>

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index c081e34..f3a6220 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1350,6 +1350,8 @@ retry:
 				    s_min_extra_isize) {
 					tried_min_extra_isize++;
 					new_extra_isize = s_min_extra_isize;
+					kfree(is);
+					kfree(bs);
 					goto retry;
 				}
 				error = -1;
--
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