SELinux: fix memory leak in security_netlbl_cache_add()

Fix memory leak in security_netlbl_cache_add()
Note: The Coverity checker gets credit for spotting this one.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>

security/selinux/ss/services.c

@@ -2417,8 +2417,10 @@ static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
 
 	cache->type = NETLBL_CACHE_T_MLS;
 	if (ebitmap_cpy(&cache->data.mls_label.level[0].cat,
-			&ctx->range.level[0].cat) != 0)
+			&ctx->range.level[0].cat) != 0) {
+		kfree(cache);
 		return;
+	}
 	cache->data.mls_label.level[1].cat.highbit =
 		cache->data.mls_label.level[0].cat.highbit;
 	cache->data.mls_label.level[1].cat.node =