int tls1_set_curves(unsigned char **pext, size_t *pextlen,
                    int *curves, size_t ncurves)
{
    unsigned char *clist, *p;
    size_t i;
    /*
     * Bitmap of curves included to detect duplicates: only works while curve
     * ids < 32
     */
    unsigned long dup_list = 0;
    clist = OPENSSL_malloc(ncurves * 2);
    if (clist == NULL)
        return 0;
    for (i = 0, p = clist; i < ncurves; i++) {
        unsigned long idmask;
        int id;
        id = tls1_ec_nid2curve_id(curves[i]);
        idmask = 1L << id;
        if (!id || (dup_list & idmask)) {
            OPENSSL_free(clist);
            return 0;
        }
        dup_list |= idmask;
        s2n(id, p);
    }
    OPENSSL_free(*pext);
    *pext = clist;
    *pextlen = ncurves * 2;
    return 1;
}

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.