To: Greg Kroah-Hartman <gregkh@suse.de>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: sds@tycho.nsa.gov, jmorris@namei.org, casey@schaufler-ca.com,
       linux-security-module@vger.kernel.org
Subject: [PATCH] sysfs: Don't leak secdata when a sysfs_dirent is freed.
From: ebiederm@xmission.com (Eric W. Biederman)
User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)
Date: Wed, 04 Nov 2009 02:50:06 -0800
Message-ID: <m1zl7236ox.fsf@fess.ebiederm.org>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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Lines: 43


While refreshing my sysfs patches I noticed a leak in the secdata
implementation.  We don't free the secdata when we free the
sysfs dirent. 

This is a bug in 2.6.32-rc5 that we really should close.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---

 fs/sysfs/dir.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 5fad489..e020183 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -21,6 +21,7 @@
 #include <linux/completion.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/security.h>
 #include "sysfs.h"
 
 DEFINE_MUTEX(sysfs_mutex);
@@ -285,6 +286,9 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 		sysfs_put(sd->s_symlink.target_sd);
 	if (sysfs_type(sd) & SYSFS_COPY_NAME)
 		kfree(sd->s_name);
+	if (sd->s_iattr && sd->s_iattr->ia_secdata)
+		security_release_secctx(sd->s_iattr->ia_secdata,
+					sd->s_iattr->ia_secdata_len);
 	kfree(sd->s_iattr);
 	sysfs_free_ino(sd->s_ino);
 	kmem_cache_free(sysfs_dir_cachep, sd);
-- 
1.6.5.2.143.g8cc62

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