void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
{
    const unsigned char *sigalgs;
    size_t i, sigalgslen;
    int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
    /*
     * Now go through all signature algorithms seeing if we support any for
     * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
     * down calls to security callback only check if we have to.
     */
    sigalgslen = tls12_get_psigalgs(s, &sigalgs);
    for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) {
        switch (sigalgs[1]) {
#ifndef OPENSSL_NO_RSA
        case TLSEXT_signature_rsa:
            if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_rsa = 1;
            break;
#endif
#ifndef OPENSSL_NO_DSA
        case TLSEXT_signature_dsa:
            if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_dsa = 1;
            break;
#endif
#ifndef OPENSSL_NO_EC
        case TLSEXT_signature_ecdsa:
            if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
                have_ecdsa = 1;
            break;
#endif
        }
    }
    if (!have_rsa)
        *pmask_a |= SSL_aRSA;
    if (!have_dsa)
        *pmask_a |= SSL_aDSS;
    if (!have_ecdsa)
        *pmask_a |= SSL_aECDSA;
}

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.