Fix crash with empty DHCP string options.

CHANGELOG

@@ -60,6 +60,9 @@ version 2.67
 	    AudioCodes Voice Gateways doing streaming writes to flash.
 	    Thanks to Damian Kaczkowski for spotting the problem.
 
+	    Fix crash with empty DHCP string options when adding zero
+	    terminator. Thanks to Patrick McClean for the bug report.
+
 
 version 2.66
             Add the ability to act as an authoritative DNS

src/rfc2131.c

@@ -1833,7 +1833,8 @@ static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *c
 	    }
 	}
       else
-	memcpy(p, opt->val, len);
+	/* empty string may be extended to "\0" by null_term */
+	memcpy(p, opt->val ? opt->val : (unsigned char *)"", len);
     }  
   return len;
 }