builtin/help: fix dangling reference to `html_path`
In `get_html_page_path()` we may end up assigning the return value of `system_path()` to the global `html_path` variable. But as we also assign the returned value to `to_free`, we will deallocate its memory upon returning from the function. Consequently, `html_path` will now point to deallocated memory. Fix this issue by instead assigning the value to a separate local variable. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Patrick Steinhardt committed
Sep 26, 2024 at 13:46 UTC
02e36f9ffaf1f2395a19dc10c15423883c7b2817
1 file changed
+7
-6
builtin/help.c
+7
-6
index dc1fbe2b98..282ea5721f 100644
--- a/builtin/help.c
+++ b/builtin/help.c
@@ -513,23 +513,24 @@ static void show_info_page(const char *page)
static void get_html_page_path(struct strbuf *page_path, const char *page)
{
struct stat st;
+ const char *path = html_path;
char *to_free = NULL;
- if (!html_path)
- html_path = to_free = system_path(GIT_HTML_PATH);
+ if (!path)
+ path = to_free = system_path(GIT_HTML_PATH);
/*
* Check that the page we're looking for exists.
*/
- if (!strstr(html_path, "://")) {
- if (stat(mkpath("%s/%s.html", html_path, page), &st)
+ if (!strstr(path, "://")) {
+ if (stat(mkpath("%s/%s.html", path, page), &st)
|| !S_ISREG(st.st_mode))
die("'%s/%s.html': documentation file not found.",
- html_path, page);
+ path, page);
}
strbuf_init(page_path, 0);
- strbuf_addf(page_path, "%s/%s.html", html_path, page);
+ strbuf_addf(page_path, "%s/%s.html", path, page);
free(to_free);
}