selinux: fix possible memory leak

Free 'ctx_str' when necessary.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index a91d205ec0c6..cf79a4564e38 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -327,19 +327,22 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
                 return rc;
 
         ctx = kmalloc(sizeof(*ctx) + str_len, GFP_ATOMIC);
-        if (!ctx)
-                return -ENOMEM;
+        if (!ctx) {
+                rc = -ENOMEM;
+                goto out;
+        }
 
         ctx->ctx_doi = XFRM_SC_DOI_LSM;
         ctx->ctx_alg = XFRM_SC_ALG_SELINUX;
         ctx->ctx_sid = secid;
         ctx->ctx_len = str_len;
         memcpy(ctx->ctx_str, ctx_str, str_len);
-        kfree(ctx_str);
 
         x->security = ctx;
         atomic_inc(&selinux_xfrm_refcount);
-        return 0;
+out:
+        kfree(ctx_str);
+        return rc;
 }
 
 /*