int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
{
    int i;

    *outl = 0;
    if (ctx->num != 0) {
        i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);
        if (i < 0)
            return (-1);
        ctx->num = 0;
        *outl = i;
        return (1);
    } else
        return (1);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.