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Commit f2f00981 authored by Changli Gao's avatar Changli Gao Committed by David S. Miller
Browse files

sch_sfq: add sanity check for the packet length 



The packet length should be checked before the packet data is dereferenced.

Signed-off-by: default avatarChangli Gao <xiaosuo@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 12dc96d1

net/sched/sch_sfq.c

+20 −9
Original line number Diff line number Diff line
@@ -122,7 +122,11 @@ static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb) 
	switch (skb->protocol) {

	case htons(ETH_P_IP):

	{

		const struct iphdr *iph = ip_hdr(skb);

		const struct iphdr *iph;



		if (!pskb_network_may_pull(skb, sizeof(*iph)))

			goto err;

		iph = ip_hdr(skb);

		h = (__force u32)iph->daddr;

		h2 = (__force u32)iph->saddr ^ iph->protocol;

		if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
@@ -131,25 +135,32 @@ static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb) 
		     iph->protocol == IPPROTO_UDPLITE ||

		     iph->protocol == IPPROTO_SCTP ||

		     iph->protocol == IPPROTO_DCCP ||

		     iph->protocol == IPPROTO_ESP))

		     iph->protocol == IPPROTO_ESP) &&

		     pskb_network_may_pull(skb, iph->ihl * 4 + 4))

			h2 ^= *(((u32*)iph) + iph->ihl);

		break;

	}

	case htons(ETH_P_IPV6):

	{

		struct ipv6hdr *iph = ipv6_hdr(skb);

		struct ipv6hdr *iph;



		if (!pskb_network_may_pull(skb, sizeof(*iph)))

			goto err;

		iph = ipv6_hdr(skb);

		h = (__force u32)iph->daddr.s6_addr32[3];

		h2 = (__force u32)iph->saddr.s6_addr32[3] ^ iph->nexthdr;

		if (iph->nexthdr == IPPROTO_TCP ||

		if ((iph->nexthdr == IPPROTO_TCP ||

		     iph->nexthdr == IPPROTO_UDP ||

		     iph->nexthdr == IPPROTO_UDPLITE ||

		     iph->nexthdr == IPPROTO_SCTP ||

		     iph->nexthdr == IPPROTO_DCCP ||

		    iph->nexthdr == IPPROTO_ESP)

		     iph->nexthdr == IPPROTO_ESP) &&

		    pskb_network_may_pull(skb, sizeof(*iph) + 4))

			h2 ^= *(u32*)&iph[1];

		break;

	}

	default:

err:

		h = (unsigned long)skb_dst(skb) ^ (__force u32)skb->protocol;

		h2 = (unsigned long)skb->sk;

	}