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authorDang Hongwu <hongwu.dang@6wind.com>2011-01-11 07:13:33 +0000
committerDavid S. Miller <davem@davemloft.net>2011-01-11 14:03:10 -0800
commit4b0ef1f223be4e092632b4152ceec5627ac10f59 (patch)
tree79472554ddc96359cdfe07f6b4967dabe9cb5eaa /net/ipv4/ah4.c
parentah: update maximum truncated ICV length (diff)
downloadlinux-dev-4b0ef1f223be4e092632b4152ceec5627ac10f59.tar.xz
linux-dev-4b0ef1f223be4e092632b4152ceec5627ac10f59.zip
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>
Diffstat (limited to 'net/ipv4/ah4.c')
-rw-r--r--net/ipv4/ah4.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 880a5ec6dce0..86961bec70ab 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;