net/ieee802154: Drop fragmented packet if first frag is not present (af4148c8) · Commits · Wenxi XU / zephyr

subsys/net/l2/ieee802154/ieee802154_fragment.c

+11 −3

Original line number	Diff line number	Diff line
		@@ -472,6 +472,11 @@ static inline void fragment_reconstruct_packet(struct net_pkt *pkt)
		fragment_remove_headers(pkt);
		}

		static inline bool fragment_packet_valid(struct net_pkt *pkt)
		{
		return (get_datagram_type(pkt->buffer->data) == NET_6LO_DISPATCH_FRAG1);
		}

		/**
		* Parse size and tag from the fragment, check if we have any cache
		* related to it. If not create a new cache.
		@@ -537,11 +542,14 @@ static inline enum net_verdict fragment_add_to_cache(struct net_pkt *pkt)
		cache->pkt = NULL;
		}

		clear_reass_cache(size, tag);

		fragment_reconstruct_packet(pkt);
		if (!fragment_packet_valid(pkt)) {
		NET_ERR("Invalid fragmented packet");
		return NET_DROP;
		}

		/* Once reassemble is done, cache is no longer needed. */
		clear_reass_cache(size, tag);
		fragment_reconstruct_packet(pkt);

		if (!net_6lo_uncompress(pkt)) {
		NET_ERR("Could not uncompress. Bogus packet?");