static void reds_handle_read_link_done(void *opaque)
{
    RedLinkInfo *link = (RedLinkInfo *)opaque;
    SpiceLinkMess *link_mess = link->link_mess;
    AsyncRead *obj = &link->async_read;
    uint32_t num_caps = link_mess->num_common_caps + link_mess->num_channel_caps;
    uint32_t *caps = (uint32_t *)((uint8_t *)link_mess + link_mess->caps_offset);
    int auth_selection;

    if (num_caps && (num_caps * sizeof(uint32_t) + link_mess->caps_offset >
                     link->link_header.size ||
                     link_mess->caps_offset < sizeof(*link_mess))) {
        reds_send_link_error(link, SPICE_LINK_ERR_INVALID_DATA);
        reds_link_free(link);
        return;
    }

    auth_selection = test_capabilty(caps, link_mess->num_common_caps,
                                    SPICE_COMMON_CAP_PROTOCOL_AUTH_SELECTION);

    if (!reds_security_check(link)) {
        if (link->stream->ssl) {
            spice_warning("spice channels %d should not be encrypted", link_mess->channel_type);
            reds_send_link_error(link, SPICE_LINK_ERR_NEED_UNSECURED);
        } else {
            spice_warning("spice channels %d should be encrypted", link_mess->channel_type);
            reds_send_link_error(link, SPICE_LINK_ERR_NEED_SECURED);
        }
        reds_link_free(link);
        return;
    }

    if (!reds_send_link_ack(link)) {
        reds_link_free(link);
        return;
    }

    if (!auth_selection) {
        if (sasl_enabled && !link->skip_auth) {
            spice_warning("SASL enabled, but peer supports only spice authentication");
            reds_send_link_error(link, SPICE_LINK_ERR_VERSION_MISMATCH);
            return;
        }
        spice_warning("Peer doesn't support AUTH selection");
        reds_get_spice_ticket(link);
    } else {
        obj->now = (uint8_t *)&link->auth_mechanism;
        obj->end = obj->now + sizeof(SpiceLinkAuthMechanism);
        obj->done = reds_handle_auth_mechanism;
        async_read_handler(0, 0, &link->async_read);
    }
}

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.