--- recvfile.c.orig     2013-07-17 19:50:43.587919082 -0700
+++ recvfile.c  2013-07-17 19:51:51.016918916 -0700
@@ -260,6 +260,11 @@
        }
 
        old_flags = fcntl(sockfd, F_GETFL, 0);
+       if (old_flags == -1) {
+               free(buffer);
+               return -1;
+       }
+
        if (set_blocking(sockfd, true) == -1) {
                free(buffer);
                return -1;