net.c: Fix a memory leak in makesock().

"port" was allocated dynamically but never freed. Fix it by
using a static buffer instead. This buffer can not overflow as
"port_number" is an unsigned short, so its decimal representation
consists of at most 5 digits.

diff --git a/net.c b/net.c
index 2db3405..10fc121 100644 (file)
--- a/net.c
+++ b/net.c
@@ -147,10 +147,11 @@ int makesock(unsigned l3type, unsigned l4type, int passive,
 {
        struct addrinfo *local = NULL, *src,
                        *remote = NULL, *dst, hints;
-       char            *port = make_message("%u", port_number);
        int             rc, on = 1, sockfd = -1,
                        socktype = sock_type(l4type);
+       char port[6]; /* port number has at most 5 digits */
 
+       sprintf(port, "%u", port_number);
        /* Set up address hint structure */
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = l3type;