static void AppLayerProtoDetectPMFreeSignature(AppLayerProtoDetectPMSignature *sig)
{
    SCEnter();
    if (sig == NULL)
        SCReturn;
    if (sig->cd)
        DetectContentFree(sig->cd);
    SCFree(sig);
    SCReturn;
}

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.