int __glXDisp_DestroyPixmap(__GLXclientState *cl, GLbyte *pc)
{
    xGLXDestroyPixmapReq *req = (xGLXDestroyPixmapReq *) pc;

    return DoDestroyDrawable(cl, req->glxpixmap, GLX_DRAWABLE_PIXMAP);
}

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.