1 files changed, 16 insertions, 0 deletions
diff --git a/delta-islands.c b/delta-islands.c
index 90c0d6958f..afdec0a878 100644
--- a/delta-islands.c
+++ b/delta-islands.c
@@ -513,6 +513,22 @@ void propagate_island_marks(struct commit *commit)
 	}
 }
 
+void free_island_marks(void)
+{
+	struct island_bitmap *bitmap;
+
+	if (island_marks) {
+		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;