[krbdev.mit.edu #6816] potential memory leak in spnego

[Arlene Berry via RT]

In src/lib/gssapi/spnego/spnego_mech.c in init_ctx_new and
acc_ctx_hints, if create_spnego_ctx succeeds but put_mech_set fails, sc
will be leaked.

--- src/lib/gssapi/spnego/spnego_mech.c	(revision 52308)
+++ src/lib/gssapi/spnego/spnego_mech.c	(revision 52309)
@@ -664,10 +664,12 @@
 	 */
 	sc->ctx_handle = GSS_C_NO_CONTEXT;
 	*ctx = (gss_ctx_id_t)sc;
+	sc = NULL;
 	*tokflag = INIT_TOKEN_SEND;
 	ret = GSS_S_CONTINUE_NEEDED;
 
 cleanup:
+	release_spnego_ctx(&sc);
 	gss_release_buffer(&tmpmin, &tmpoutput);
 	gss_delete_sec_context(&tmpmin, &tmpctx, GSS_C_NO_BUFFER);
 	gss_release_oid_set(&tmpmin, mechSet);
@@ -1358,9 +1360,11 @@
 	*return_token = INIT_TOKEN_SEND;
 	sc->firstpass = 1;
 	*ctx = (gss_ctx_id_t)sc;
+	sc = NULL;
 	ret = GSS_S_COMPLETE;
 
 cleanup:
+	release_spnego_ctx(&sc);
 	gss_release_oid_set(&tmpmin, &supported_mechSet);
 
 	return ret;