GF_Err hnti_AddBox(GF_Box *s, GF_Box *a)
{
	GF_HintTrackInfoBox *hnti = (GF_HintTrackInfoBox *)s;
	if (!hnti || !a) return GF_BAD_PARAM;

	switch (a->type) {
	case GF_ISOM_BOX_TYPE_RTP:
	case GF_ISOM_BOX_TYPE_SDP:
		if (hnti->SDP) return GF_BAD_PARAM;
		hnti->SDP = a;
		break;
	default:
		break;
	}
	return gf_isom_box_add_default(s, a);
}

The product reads data past the end, or before the beginning, of the intended buffer.