From 2614fa59fa805cd488083c5602eb48533cdbc018 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Tue, 29 Jan 2008 21:11:46 -0800 Subject: [PATCH] [IPCOMP]: Fetch nexthdr before ipch is destroyed When I moved the nexthdr setting out of IPComp I accidently moved the reading of ipch->nexthdr after the decompression. Unfortunately this means that we'd be reading from a stale ipch pointer which doesn't work very well. This patch moves the reading up so that we get the correct nexthdr value. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/ipcomp.c | 5 ++++- net/ipv6/ipcomp6.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c index f4af99ad8fd..b79cdbee68a 100644 --- a/net/ipv4/ipcomp.c +++ b/net/ipv4/ipcomp.c @@ -74,6 +74,7 @@ out: static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb) { + int nexthdr; int err = -ENOMEM; struct ip_comp_hdr *ipch; @@ -84,13 +85,15 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb) /* Remove ipcomp header and decompress original payload */ ipch = (void *)skb->data; + nexthdr = ipch->nexthdr; + skb->transport_header = skb->network_header + sizeof(*ipch); __skb_pull(skb, sizeof(*ipch)); err = ipcomp_decompress(x, skb); if (err) goto out; - err = ipch->nexthdr; + err = nexthdr; out: return err; diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c index b276d04d6db..710325e7a84 100644 --- a/net/ipv6/ipcomp6.c +++ b/net/ipv6/ipcomp6.c @@ -64,6 +64,7 @@ static LIST_HEAD(ipcomp6_tfms_list); static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb) { + int nexthdr; int err = -ENOMEM; struct ip_comp_hdr *ipch; int plen, dlen; @@ -79,6 +80,8 @@ static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb) /* Remove ipcomp header and decompress original payload */ ipch = (void *)skb->data; + nexthdr = ipch->nexthdr; + skb->transport_header = skb->network_header + sizeof(*ipch); __skb_pull(skb, sizeof(*ipch)); @@ -108,7 +111,7 @@ static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb) skb->truesize += dlen - plen; __skb_put(skb, dlen - plen); skb_copy_to_linear_data(skb, scratch, dlen); - err = ipch->nexthdr; + err = nexthdr; out_put_cpu: put_cpu(); -- 2.20.1