From a560d87033729d884acb3f198cc52edd6c816416 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= Date: Tue, 4 Apr 2017 17:21:19 +0700 Subject: [PATCH] environment.c: fix potential segfault by get_git_common_dir() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit setup_git_env() must be called before this function to initialize git_common_dir so that it returns a non NULL string. And it must return a non NULL string or segfault can happen because all callers expect so. It does not do so explicitly though and depends on get_git_dir() being called first (which will guarantee setup_git_env()). Avoid this dependency and call setup_git_env() by itself. test-ref-store.c will hit this problem because it's very lightweight, just enough initialization to exercise refs code, and get_git_dir() will never be called until get_worktrees() is, which uses get_git_common_dir and hits a segfault. Signed-off-by: Nguyễn Thái Ngọc Duy Signed-off-by: Junio C Hamano --- environment.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/environment.c b/environment.c index 42dc3106d2..2986ee7200 100644 --- a/environment.c +++ b/environment.c @@ -214,6 +214,8 @@ const char *get_git_dir(void) const char *get_git_common_dir(void) { + if (!git_dir) + setup_git_env(); return git_common_dir; }