Prune the stats walk and guard its dates

1 file changed, 9 insertions, 1 deletion

diff --git a/source/ui-stats.c b/source/ui-stats.c
index f6d2637..3ae3034 100644
--- a/source/ui-stats.c
+++ b/source/ui-stats.c
@@ -190,7 +190,11 @@ static void add_commit(struct string_list *authors, struct commitinfo *info,
 	authorstat = author->util;
 	items = &authorstat->list;
 	t = info->committer_date;
-	gmtime_r(&t, &date);
+	// A crafted commit can carry a date outside the range gmtime_r can
+	// represent, which would leave date uninitialized and later index
+	// the month table out of bounds. Drop such a commit from the stats.
+	if (!gmtime_r(&t, &date))
+		return;
 	period->trunc(&date);
 	tmp = xstrdup(period->pretty(&date));
 	item = string_list_insert(items, tmp);
@@ -246,6 +250,10 @@ static struct string_list collect_stats(const struct cgit_period *period)
 	rev.verbose_header = 1;
 	rev.show_root_diff = 0;
 	setup_revisions(argc, argv, &rev, NULL);
+	// Prune the walk to the displayed window instead of traversing the
+	// whole history and discarding older commits. The in-process check
+	// below still bounds the period edge exactly.
+	rev.max_age = since;
 	prepare_revision_walk(&rev);
 	memset(&authors, 0, sizeof(authors));
 	while ((commit = get_revision(&rev)) != NULL) {