added error checking

git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@522 96b47cad-a561-4643-ad3b-153ac7d7599c
2011-09-02 22:15:04 +00:00
parent 84d609ea51
commit cfc8691891
1 changed files with 3 additions and 0 deletions
--- 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;