static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
{
	bool result = false;
	int r_objid;

	BUG_ON (!buf || !vb);

	r_objid = ldm_relative (buf, len, 0x18, 0);
	if (r_objid < 0) {
		ldm_error ("VBLK header is corrupt.");
		return false;
	}

	vb->flags  = buf[0x12];
	vb->type   = buf[0x13];
	vb->obj_id = ldm_get_vnum (buf + 0x18);
	ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));

	switch (vb->type) {
		case VBLK_CMP3:  result = ldm_parse_cmp3 (buf, len, vb); break;
		case VBLK_DSK3:  result = ldm_parse_dsk3 (buf, len, vb); break;
		case VBLK_DSK4:  result = ldm_parse_dsk4 (buf, len, vb); break;
		case VBLK_DGR3:  result = ldm_parse_dgr3 (buf, len, vb); break;
		case VBLK_DGR4:  result = ldm_parse_dgr4 (buf, len, vb); break;
		case VBLK_PRT3:  result = ldm_parse_prt3 (buf, len, vb); break;
		case VBLK_VOL5:  result = ldm_parse_vol5 (buf, len, vb); break;
	}

	if (result)
		ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
			 (unsigned long long) vb->obj_id, vb->type);
	else
		ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
			(unsigned long long) vb->obj_id, vb->type);

	return result;
}

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.