login-proxy: Fix potential crash when kicking user with alt username

If a new alt username field was returned after other users already were
being proxied, trying to kick with the new alt username field will crash.

diff --git a/src/login-common/login-proxy.c b/src/login-common/login-proxy.c
index 645943258a6f93b210e7c11f41ba0d244ba4655e..4390196ab3605063fa81e6f20529a233a0e1b337 100644 (file)
--- a/src/login-common/login-proxy.c
+++ b/src/login-common/login-proxy.c
@@ -773,6 +773,8 @@ want_kick_alt_username(struct client *client, const char *const *args,
                if (client->alt_usernames[i] == NULL)
                        return FALSE;
        }
+       if (client->alt_usernames[i] == NULL)
+               return FALSE;
        return str_array_find(args, client->alt_usernames[i]);
 }