--- daq_nfq.c.orig	2015-12-31 10:17:25.295705075 -0800
+++ daq_nfq.c	2015-12-31 10:18:54.427033208 -0800
@@ -592,6 +592,13 @@
         free(impl->fcode.bf_insns);
 
     impl->filter = strdup(filter);
+    if ( !impl->filter )
+    {
+	snprintf(errBuf, errMax,
+	    "%s: can't allocate memory for device (%s)\n",
+	    __FUNCTION__, filter);
+	return DAQ_ERROR;
+    }
     impl->fcode = fcode;
 
     return DAQ_SUCCESS;