static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)
{
	int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;
	int r_id1, r_id2, r_size2, r_drive, len;
	struct vblk_volu *volu;

	BUG_ON(!buffer || !vb);
	r_objid = ldm_relative(buffer, buflen, 0x18, 0);
	if (r_objid < 0) {
		ldm_error("r_objid %d < 0", r_objid);
		return false;
	}
	r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
	if (r_name < 0) {
		ldm_error("r_name %d < 0", r_name);
		return false;
	}
	r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);
	if (r_vtype < 0) {
		ldm_error("r_vtype %d < 0", r_vtype);
		return false;
	}
	r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);
	if (r_disable_drive_letter < 0) {
		ldm_error("r_disable_drive_letter %d < 0",
				r_disable_drive_letter);
		return false;
	}
	r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);
	if (r_child < 0) {
		ldm_error("r_child %d < 0", r_child);
		return false;
	}
	r_size = ldm_relative(buffer, buflen, 0x3D, r_child);
	if (r_size < 0) {
		ldm_error("r_size %d < 0", r_size);
		return false;
	}
	if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {
		r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);
		if (r_id1 < 0) {
			ldm_error("r_id1 %d < 0", r_id1);
			return false;
		}
	} else
		r_id1 = r_size;
	if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {
		r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);
		if (r_id2 < 0) {
			ldm_error("r_id2 %d < 0", r_id2);
			return false;
		}
	} else
		r_id2 = r_id1;
	if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {
		r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);
		if (r_size2 < 0) {
			ldm_error("r_size2 %d < 0", r_size2);
			return false;
		}
	} else
		r_size2 = r_id2;
	if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
		r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);
		if (r_drive < 0) {
			ldm_error("r_drive %d < 0", r_drive);
			return false;
		}
	} else
		r_drive = r_size2;
	len = r_drive;
	if (len < 0) {
		ldm_error("len %d < 0", len);
		return false;
	}
	len += VBLK_SIZE_VOL5;
	if (len > get_unaligned_be32(buffer + 0x14)) {
		ldm_error("len %d > BE32(buffer + 0x14) %d", len,
				get_unaligned_be32(buffer + 0x14));
		return false;
	}
	volu = &vb->vblk.volu;
	ldm_get_vstr(buffer + 0x18 + r_name, volu->volume_type,
			sizeof(volu->volume_type));
	memcpy(volu->volume_state, buffer + 0x18 + r_disable_drive_letter,
			sizeof(volu->volume_state));
	volu->size = ldm_get_vnum(buffer + 0x3D + r_child);
	volu->partition_type = buffer[0x41 + r_size];
	memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));
	if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
		ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,
				sizeof(volu->drive_hint));
	}
	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.