int __glXDisp_QueryContextInfoEXT(__GLXclientState *cl, GLbyte *pc)
{
    xGLXQueryContextInfoEXTReq *req = (xGLXQueryContextInfoEXTReq *) pc;

    return DoQueryContext(cl, req->context);
}

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.