discover_git_directory(): avoid setting invalid git_dir

diff --git a/setup.c b/setup.c
index 0309c278218f96cb6b11e6a9d60011efce54cf62..ba3241bf026e87414d8f652c59fef0d120c92c19 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -977,6 +977,7 @@ const char *discover_git_directory(struct strbuf *gitdir)
                warning("ignoring git dir '%s': %s",
                        gitdir->buf + gitdir_offset, err.buf);
                strbuf_release(&err);
+               strbuf_setlen(gitdir, gitdir_offset);
                return NULL;
        }