From df34f080553bcc2e5d068a93ff2cb9488b14c374 Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Sun, 14 Sep 2008 14:08:52 +0000
Subject: added check for invalid context

---
diff --git a/src/gnutls_hooks.c b/src/gnutls_hooks.c
index 5ced25b..fd62164 100644
--- a/src/gnutls_hooks.c
+++ b/src/gnutls_hooks.c
@@ -164,6 +164,9 @@ static int cert_retrieve_fn(gnutls_session_t session, gnutls_retr_st * ret)
 
     ctxt = gnutls_transport_get_ptr(session);
 
+    if (ctxt == NULL)
+        return GNUTLS_E_INTERNAL_ERROR;
+
     if (gnutls_certificate_type_get( session) == GNUTLS_CRT_X509) {
         ret->type = GNUTLS_CRT_X509;
         ret->ncerts = ctxt->sc->certs_x509_num;
--
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