url: use blank credentials when using proxy w/o username and password

Fixes proxy regression brought in commit ad829b2 (7.71.0) Fixed #5911 Closes #5914
curl · Sep 7, 2020 · 3532262 · 3532262
1 parent 6f42e3b
commit 3532262
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/lib/url.c b/lib/url.c
@@ -2379,8 +2379,10 @@ static CURLcode parse_proxy(struct Curl_easy *data,
 static CURLcode parse_proxy_auth(struct Curl_easy *data,
                                  struct connectdata *conn)
 {
-  char *proxyuser = data->set.str[STRING_PROXYUSERNAME];
-  char *proxypasswd = data->set.str[STRING_PROXYPASSWORD];
+  const char *proxyuser = data->set.str[STRING_PROXYUSERNAME] ?
+    data->set.str[STRING_PROXYUSERNAME] : "";
+  const char *proxypasswd = data->set.str[STRING_PROXYPASSWORD] ?
+    data->set.str[STRING_PROXYPASSWORD] : "";
   CURLcode result = CURLE_OK;
 
   if(proxyuser)