gc: fix cast in compare_tasks_by_selection()
compare_tasks_by_selection() is used with QSORT and gets passed pointers
to the elements of "static struct maintenance_task tasks[]". It casts
the *addresses* of these passed pointers to element pointers, though,
and thus effectively compares some unrelated values from the stack. Fix
the casts to actually compare array elements.
Detected by USan (make SANITIZE=undefined test).
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/gc.c b/builtin/gc.c
index 3d258b6..bc25ad5 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -1253,10 +1253,8 @@ static struct maintenance_task tasks[] = {
static int compare_tasks_by_selection(const void *a_, const void *b_)
{
- const struct maintenance_task *a, *b;
-
- a = (const struct maintenance_task *)&a_;
- b = (const struct maintenance_task *)&b_;
+ const struct maintenance_task *a = a_;
+ const struct maintenance_task *b = b_;
return b->selected_order - a->selected_order;
}
