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.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/if2ip.c b/lib/if2ip.c
index b21727156..02bc6b94a 100644
--- a/lib/if2ip.c
+++ b/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