Tolerate a missing or empty repository URL

`trim_end()` returns NULL when a repo url is empty or all slashes and
the later newline trim dereferenced it. The legacy `r=` and `p=about`
path also read the last byte of the url without checking it was set.

1 file changed, 2 insertions, 1 deletion

diff --git a/source/shared.c b/source/shared.c
index a39394d..c509aa1 100644
--- a/source/shared.c
+++ b/source/shared.c
@@ -52,7 +52,8 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret = &cgit_repolist.repos[cgit_repolist.count-1];
 	memset(ret, 0, sizeof(struct cgit_repo));
 	ret->url = trim_end(url, '/');
-	*strchrnul(ret->url, '\n') = '\0';
+	if (ret->url)
+		*strchrnul(ret->url, '\n') = '\0';
 	ret->name = ret->url;
 	ret->path = NULL;
 	ret->desc = cgit_default_repo_desc;