Commit 59cae009 authored by Wei Yongjun's avatar Wei Yongjun Committed by David S. Miller

xfrm6: fix the proto and ports decode of sctp protocol

The SCTP pushed the skb above the sctp chunk header, so the
check of pskb_may_pull(skb, nh + offset + 1 - skb->data) in
_decode_session6() will never return 0 and the ports decode
of sctp will always fail. (nh + offset + 1 - skb->data < 0)
Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c615c9f3
...@@ -157,7 +157,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) ...@@ -157,7 +157,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr); ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr); ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) { while (nh + offset + 1 < skb->data ||
pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
nh = skb_network_header(skb); nh = skb_network_header(skb);
exthdr = (struct ipv6_opt_hdr *)(nh + offset); exthdr = (struct ipv6_opt_hdr *)(nh + offset);
...@@ -177,7 +178,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) ...@@ -177,7 +178,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
case IPPROTO_TCP: case IPPROTO_TCP:
case IPPROTO_SCTP: case IPPROTO_SCTP:
case IPPROTO_DCCP: case IPPROTO_DCCP:
if (!onlyproto && pskb_may_pull(skb, nh + offset + 4 - skb->data)) { if (!onlyproto && (nh + offset + 4 < skb->data ||
pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
__be16 *ports = (__be16 *)exthdr; __be16 *ports = (__be16 *)exthdr;
fl->fl_ip_sport = ports[!!reverse]; fl->fl_ip_sport = ports[!!reverse];
......
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