diff options
| author | Dang Hongwu <hongwu.dang@6wind.com> | 2011-01-11 07:13:33 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-01-11 14:03:10 -0800 |
| commit | 4b0ef1f223be4e092632b4152ceec5627ac10f59 (patch) | |
| tree | 79472554ddc96359cdfe07f6b4967dabe9cb5eaa | |
| parent | e44f391187495e0deaf7b9f0077e94f270837d1a (diff) | |
ah: reload pointers to skb data after calling skb_cow_data()
skb_cow_data() may allocate a new data buffer, so pointers on
skb should be set after this function.
Bug was introduced by commit dff3bb06 ("ah4: convert to ahash")
and 8631e9bd ("ah6: convert to ahash").
Signed-off-by: Wang Xuefu <xuefu.wang@6wind.com>
Acked-by: Krzysztof Witek <krzysztof.witek@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/ah4.c | 7 | ||||
| -rw-r--r-- | net/ipv6/ah6.c | 8 |
2 files changed, 9 insertions, 6 deletions
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c index 880a5ec6dce..86961bec70a 100644 --- a/net/ipv4/ah4.c +++ b/net/ipv4/ah4.c @@ -314,14 +314,15 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) skb->ip_summed = CHECKSUM_NONE; - ah = (struct ip_auth_hdr *)skb->data; - iph = ip_hdr(skb); - ihl = ip_hdrlen(skb); if ((err = skb_cow_data(skb, 0, &trailer)) < 0) goto out; nfrags = err; + ah = (struct ip_auth_hdr *)skb->data; + iph = ip_hdr(skb); + ihl = ip_hdrlen(skb); + work_iph = ah_alloc_tmp(ahash, nfrags, ihl + ahp->icv_trunc_len); if (!work_iph) goto out; diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index ee82d4ef26c..1aba54ae53c 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -538,14 +538,16 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) if (!pskb_may_pull(skb, ah_hlen)) goto out; - ip6h = ipv6_hdr(skb); - - skb_push(skb, hdr_len); if ((err = skb_cow_data(skb, 0, &trailer)) < 0) goto out; nfrags = err; + ah = (struct ip_auth_hdr *)skb->data; + ip6h = ipv6_hdr(skb); + + skb_push(skb, hdr_len); + work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len); if (!work_iph) goto out; |