From e1a2b0225f4d7d63d8aeacb67b789528a6b8ad98 Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Fri, 6 Dec 2013 15:24:08 +0100
Subject: [PATCH] Check if nfc_init() returns a valid context

This fixes a potential segfault when libnfc is not correctly initialized
---
 src/mfoc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mfoc.c b/src/mfoc.c
index 4f792c0..0cb917d 100644
--- a/src/mfoc.c
+++ b/src/mfoc.c
@@ -582,6 +582,10 @@ void mf_init(mfreader *r)
 {
   // Connect to the first NFC device
   nfc_init(&context);
+  if (context == NULL) {
+    ERR("Unable to init libnfc (malloc)");
+    exit(EXIT_FAILURE);
+  }
   r->pdi = nfc_open(context, NULL);
   if (!r->pdi) {
     printf("No NFC device found.\n");