linux-kernel - [ 078/128] fs/cifs/cifs_dfs_ref.c: fix potential memory leakage

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Message-Id: <20130203144651.016788660@decadent.org.uk>
Date:	Sun, 03 Feb 2013 15:48:02 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Cong Ding <dinggnu@...il.com>,
	Jeff Layton <jlayton@...hat.com>,
	Steve French <smfrench@...il.com>
Subject: [ 078/128] fs/cifs/cifs_dfs_ref.c: fix potential memory leakage

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

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

From: Cong Ding <dinggnu@...il.com>

commit 10b8c7dff5d3633b69e77f57d404dab54ead3787 upstream.

When it goes to error through line 144, the memory allocated to *devname is
not freed, and the caller doesn't free it either in line 250. So we free the
memroy of *devname in function cifs_compose_mount_options() when it goes to
error.

Signed-off-by: Cong Ding <dinggnu@...il.com>
Reviewed-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/cifs/cifs_dfs_ref.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index ce5cbd7..210fce2 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -226,6 +226,8 @@ compose_mount_options_out:
 compose_mount_options_err:
 	kfree(mountdata);
 	mountdata = ERR_PTR(rc);
+	kfree(*devname);
+	*devname = NULL;
 	goto compose_mount_options_out;
 }
 


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