ProcRenderReferenceGlyphSet (ClientPtr client)
{
    GlyphSetPtr     glyphSet;
    int rc;
    REQUEST(xRenderReferenceGlyphSetReq);

    REQUEST_SIZE_MATCH(xRenderReferenceGlyphSetReq);

    LEGAL_NEW_RESOURCE(stuff->gsid, client);

    rc = dixLookupResourceByType((pointer *)&glyphSet, stuff->existing, GlyphSetType,
			   client, DixGetAttrAccess);
    if (rc != Success)
    {
	client->errorValue = stuff->existing;
	return rc;
    }
    glyphSet->refcnt++;
    if (!AddResource (stuff->gsid, GlyphSetType, (pointer)glyphSet))
	return BadAlloc;
    return Success;
}

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.