static int build_free_segmap(struct f2fs_sb_info *sbi)
{
	struct free_segmap_info *free_i;
	unsigned int bitmap_size, sec_bitmap_size;

	/* allocate memory for free segmap information */
	free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
	if (!free_i)
		return -ENOMEM;

	SM_I(sbi)->free_info = free_i;

	bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
	free_i->free_segmap = kvmalloc(bitmap_size, GFP_KERNEL);
	if (!free_i->free_segmap)
		return -ENOMEM;

	sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
	free_i->free_secmap = kvmalloc(sec_bitmap_size, GFP_KERNEL);
	if (!free_i->free_secmap)
		return -ENOMEM;

	/* set all segments as dirty temporarily */
	memset(free_i->free_segmap, 0xff, bitmap_size);
	memset(free_i->free_secmap, 0xff, sec_bitmap_size);

	/* init free segmap information */
	free_i->start_segno = GET_SEGNO_FROM_SEG0(sbi, MAIN_BLKADDR(sbi));
	free_i->free_segments = 0;
	free_i->free_sections = 0;
	spin_lock_init(&free_i->segmap_lock);
	return 0;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.