static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags)
{
	struct frag *f;
	struct list_head *item;
	int rec, num, group;

	BUG_ON (!data || !frags);

	if (size < 2 * VBLK_SIZE_HEAD) {
		ldm_error("Value of size is to small.");
		return false;
	}

	group = get_unaligned_be32(data + 0x08);
	rec   = get_unaligned_be16(data + 0x0C);
	num   = get_unaligned_be16(data + 0x0E);
	if ((num < 1) || (num > 4)) {
		ldm_error ("A VBLK claims to have %d parts.", num);
		return false;
	}
	if (rec >= num) {
		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num);
		return false;
	}

	list_for_each (item, frags) {
		f = list_entry (item, struct frag, list);
		if (f->group == group)
			goto found;
	}

	f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
	if (!f) {
		ldm_crit ("Out of memory.");
		return false;
	}

	f->group = group;
	f->num   = num;
	f->rec   = rec;
	f->map   = 0xFF << num;
 
 	list_add_tail (&f->list, frags);
 found:
	if (rec >= f->num) {
		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
		return false;
	}

 	if (f->map & (1 << rec)) {
 		ldm_error ("Duplicate VBLK, part %d.", rec);
 		f->map &= 0x7F;			/* Mark the group as broken */
		return false;
	}

	f->map |= (1 << rec);

	data += VBLK_SIZE_HEAD;
	size -= VBLK_SIZE_HEAD;

	memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);

	return true;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.