From 1ab93312cd29e4fe0939544a00c39d7de6cef9b5 Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Wed, 21 Nov 2018 12:31:41 +0100
Subject: [PATCH] SM: fix crash if nested GET RESPONSE issued during sm session
 fails or returns invalid MAC.

---
 src/sm/sm-iso.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/sm/sm-iso.c b/src/sm/sm-iso.c
index b702a2f4..9669e07e 100644
--- a/src/sm/sm-iso.c
+++ b/src/sm/sm-iso.c
@@ -661,6 +661,10 @@ static int iso_add_sm(struct iso_sm_ctx *sctx, sc_card_t *card,
 static int iso_rm_sm(struct iso_sm_ctx *sctx, sc_card_t *card,
 		sc_apdu_t *sm_apdu, sc_apdu_t *apdu)
 {
+	if (!sctx)
+		SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, SC_ERROR_INVALID_ARGUMENTS,
+			"Invalid SM context. No SM processing performed.");
+
 	if (sctx->post_transmit)
 		SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, sctx->post_transmit(card, sctx, sm_apdu),
 				"Could not complete SM specific post transmit routine");