From cfc86918917605fcab9c766dd9104382ef40e0f2 Mon Sep 17 00:00:00 2001
From: frankmorgner <frankmorgner@96b47cad-a561-4643-ad3b-153ac7d7599c>
Date: Fri, 2 Sep 2011 22:15:04 +0000
Subject: [PATCH] added error checking

git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@522 96b47cad-a561-4643-ad3b-153ac7d7599c
---
 npa/src/sm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/npa/src/sm.c b/npa/src/sm.c
index dba1a12..60bd9de 100644
--- a/npa/src/sm.c
+++ b/npa/src/sm.c
@@ -578,6 +578,9 @@ int sm_transmit_apdu(struct sm_ctx *sctx, sc_card_t *card,
     sc_apdu_t sm_apdu;
     u8 rbuf[0xffff], sbuf[0xffff];
 
+    if (!card)
+        return SC_ERROR_INVALID_ARGUMENTS;
+
     sm_apdu.data = sbuf;
     sm_apdu.datalen = sizeof sbuf;
     sm_apdu.resp = rbuf;