1 files changed, 14 insertions, 0 deletions
diff --git a/delta-islands.c b/delta-islands.c
index 90c0d6958f..8b234cb85b 100644
--- a/delta-islands.c
+++ b/delta-islands.c
@@ -513,6 +513,20 @@ void propagate_island_marks(struct commit *commit)
 	}
 }
 
+void free_island_marks(void)
+{
+	struct island_bitmap *bitmap;
+
+	kh_foreach_value(island_marks, bitmap, {
+		if (!--bitmap->refcount)
+			free(bitmap);
+	});
+	kh_destroy_oid_map(island_marks);
+
+	/* detect use-after-free with a an address which is never valid: */
+	island_marks = (void *)-1;
+}
+
 int compute_pack_layers(struct packing_data *to_pack)
 {
 	uint32_t i;