Song Ma found a memory leak in the if2ip code if you pass in an interface

name longer than the name field of the ifreq struct (typically 6 bytes), as
then it wouldn't close the used dummy socket.

CHANGES

@@ -6,6 +6,12 @@
 
                                   Changelog
 
+Daniel S (12 April 2007)
+- Song Ma found a memory leak in the if2ip code if you pass in an interface
+  name longer than the name field of the ifreq struct (typically 6 bytes), as
+  then it wouldn't close the used dummy socket. Bug #1698974
+  (http://curl.haxx.se/bug/view.cgi?id=1698974)
+
 Version 7.16.2 (11 April 2007)
 
 Yang Tse (10 April 2007)

lib/if2ip.c

@@ -98,8 +98,10 @@ char *Curl_if2ip(const char *interface, char *buf, int buf_size)
     struct ifreq req;
     size_t len = strlen(interface);
     memset(&req, 0, sizeof(req));
-    if(len >= sizeof(req.ifr_name))
+    if(len >= sizeof(req.ifr_name)) {
+      sclose(dummy);
       return NULL; /* this can't be a fine interface name */
+    }
     memcpy(req.ifr_name, interface, len+1);
     req.ifr_addr.sa_family = AF_INET;
 #ifdef IOCTL_3_ARGS