Commit 27785d83 authored by Joonwoo Park's avatar Joonwoo Park Committed by David S. Miller
Browse files

[LLC]: bogus llc packet length 



discard llc packet which has bogus packet length.

Signed-off-by: default avatarJoonwoo Park <joonwpark81@gmail.com>
Acked-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2ba2506c

net/llc/llc_input.c

+5 −1
Original line number Diff line number Diff line
@@ -117,8 +117,12 @@ static inline int llc_fixup_skb(struct sk_buff *skb) 
	skb_pull(skb, llc_len);

	if (skb->protocol == htons(ETH_P_802_2)) {

		__be16 pdulen = eth_hdr(skb)->h_proto;

		u16 data_size = ntohs(pdulen) - llc_len;

		s32 data_size = ntohs(pdulen) - llc_len;



		if (data_size < 0 ||

		    ((skb_tail_pointer(skb) -

		      (u8 *)pdu) - llc_len) < data_size)

			return 0;

		if (unlikely(pskb_trim_rcsum(skb, data_size)))

			return 0;

	}