URL: return error on malformed URLs with junk after IPv6 bracket

Follow-up to aadb7c7. Verified by new test 1263.

Closes #2072

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index 6d7d2d460..d2208d5eb 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3337,7 +3337,13 @@ static CURLcode parse_remote_port(struct Curl_easy *data,
     portptr = strchr(conn->host.name, ']');
     if(portptr) {
       *portptr++ = '\0'; /* zero terminate, killing the bracket */
-      if(':' != *portptr)
+      if(*portptr) {
+        if (*portptr != ':') {
+          failf(data, "IPv6 closing bracket followed by '%c'", *portptr);
+          return CURLE_URL_MALFORMAT;
+        }
+      }
+      else
         portptr = NULL; /* no port number available */
     }
   }