[glib/mcatanzaro/#2597: 21/22] gsimpleproxyresolver: ensure default proxy is valid

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1f97c8ed7c5fdfca66e5adef5b10859ed7692677
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Mon Jun 13 13:00:01 2022 -0500

    gsimpleproxyresolver: ensure default proxy is valid
    
    It should be either a valid URI, or NULL. Passing empty strings or other
    invalid URIs is no bueno.

 gio/gsimpleproxyresolver.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gio/gsimpleproxyresolver.c b/gio/gsimpleproxyresolver.c
index 931d974533..8de26cb7b6 100644
--- a/gio/gsimpleproxyresolver.c
+++ b/gio/gsimpleproxyresolver.c
@@ -537,6 +537,7 @@ g_simple_proxy_resolver_set_default_proxy (GSimpleProxyResolver *resolver,
                                            const gchar          *default_proxy)
 {
   g_return_if_fail (G_IS_SIMPLE_PROXY_RESOLVER (resolver));
+  g_return_if_fail (default_proxy == NULL || g_uri_is_valid (default_proxy, G_URI_FLAGS_NONE, NULL));
 
   g_free (resolver->priv->default_proxy);
   resolver->priv->default_proxy = g_strdup (default_proxy);