run_hook(): check the executability of the hook before filling argv

Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

run-command.c

@@ -352,6 +352,9 @@ int run_hook(const char *index_file, const char *name, ...)
 	int ret;
 	int i;
 
+	if (access(git_path("hooks/%s", name), X_OK) < 0)
+		return 0;
+
 	va_start(args, name);
 	argv[0] = git_path("hooks/%s", name);
 	i = 0;
@@ -362,9 +365,6 @@ int run_hook(const char *index_file, const char *name, ...)
 	} while (argv[i]);
 	va_end(args);
 
-	if (access(argv[0], X_OK) < 0)
-		return 0;
-
 	memset(&hook, 0, sizeof(hook));
 	hook.argv = argv;
 	hook.no_stdin = 1;