check for conf.error_handler before using it

diff --git a/file.c b/file.c
index a6350eb..b2e6ade 100644 (file)
--- a/file.c
+++ b/file.c
@@ -699,10 +699,12 @@ void uh_handle_request(struct client *cl)
        if (__handle_file_request(cl, url))
                return;
 
-       error_handler = alloca(strlen(conf.error_handler) + 1);
-       strcpy(error_handler, conf.error_handler);
-       if (__handle_file_request(cl, error_handler))
-               return;
+       if (conf.error_handler) {
+               error_handler = alloca(strlen(conf.error_handler) + 1);
+               strcpy(error_handler, conf.error_handler);
+               if (__handle_file_request(cl, error_handler))
+                       return;
+       }
 
        uh_client_error(cl, 404, "Not Found", "The requested URL %s was not found on this server.", url);
 }