diff --git a/fs/udf/super.c b/fs/udf/super.c
index 8411db883cbc..8004eff339b0 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1045,6 +1045,7 @@ static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 {
 	struct udf_bitmap *bitmap;
 	int nr_groups = udf_compute_nr_groups(sb, index);
+	int i;
 
 	bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
 			  GFP_KERNEL);
@@ -1052,6 +1053,10 @@ static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 		return NULL;
 
 	bitmap->s_nr_groups = nr_groups;
+
+	for (i = 0; i < nr_groups; i++)
+		bitmap->s_block_bitmap[i] = NULL;
+
 	return bitmap;
 }