static void mac80211_hwsim_add_vendor_rtap(struct sk_buff *skb)
{
	/*
	 * To enable this code, #define the HWSIM_RADIOTAP_OUI,
	 * e.g. like this:
	 * #define HWSIM_RADIOTAP_OUI "\x02\x00\x00"
	 * (but you should use a valid OUI, not that)
	 *
	 * If anyone wants to 'donate' a radiotap OUI/subns code
	 * please send a patch removing this #ifdef and changing
	 * the values accordingly.
	 */
#ifdef HWSIM_RADIOTAP_OUI
	struct ieee80211_vendor_radiotap *rtap;

	/*
	 * Note that this code requires the headroom in the SKB
	 * that was allocated earlier.
	 */
	rtap = skb_push(skb, sizeof(*rtap) + 8 + 4);
	rtap->oui[0] = HWSIM_RADIOTAP_OUI[0];
	rtap->oui[1] = HWSIM_RADIOTAP_OUI[1];
	rtap->oui[2] = HWSIM_RADIOTAP_OUI[2];
	rtap->subns = 127;

	/*
	 * Radiotap vendor namespaces can (and should) also be
	 * split into fields by using the standard radiotap
	 * presence bitmap mechanism. Use just BIT(0) here for
	 * the presence bitmap.
	 */
	rtap->present = BIT(0);
	/* We have 8 bytes of (dummy) data */
	rtap->len = 8;
	/* For testing, also require it to be aligned */
	rtap->align = 8;
	/* And also test that padding works, 4 bytes */
	rtap->pad = 4;
	/* push the data */
	memcpy(rtap->data, "ABCDEFGH", 8);
	/* make sure to clear padding, mac80211 doesn't */
	memset(rtap->data + 8, 0, 4);

	IEEE80211_SKB_RXCB(skb)->flag |= RX_FLAG_RADIOTAP_VENDOR_DATA;
#endif
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.