[PATCH 1/3] ui-shared: don't print path crumbs without a repo

[john at keeping.me.uk (John Keeping)]

cgit_print_path_crumbs() can call repolink() which assumes that ctx.repo
is non-null.  Currently we don't have any commands that set want_vpath
without also setting want_repo so it shouldn't be possible to fail this
test, but the check in cgit.c is in the wrong order so it is possible to
specify a query string like "?p=log&path=foo/bar" to end up here without
a valid repository.

This was found by American fuzzy lop [0].

[0] http://lcamtuf.coredump.cx/afl/

Signed-off-by: John Keeping <john at keeping.me.uk>
---
 ui-shared.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui-shared.c b/ui-shared.c
index 2e4fcd9..e5c9a02 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1039,7 +1039,7 @@ void cgit_print_pageheader(void)
 		free(currenturl);
 	}
 	html("</td></tr></table>\n");
-	if (ctx.env.authenticated && ctx.qry.vpath) {
+	if (ctx.env.authenticated && ctx.repo && ctx.qry.vpath) {
 		html("<div class='path'>");
 		html("path: ");
 		cgit_print_path_crumbs(ctx.qry.vpath);
-- 
2.12.0.rc2.230.ga28edc07cd