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ipsec: Fix pskb_expand_head corruption in xfrm_state_check_space 

We're never supposed to shrink the headroom or tailroom.  In fact,
shrinking the headroom is a fatal action.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2008-09-30 02:03:19 -07:00 committed by David S. Miller
parent 94aca1dac6
commit d01dbeb6af
1 changed files with 7 additions and 3 deletions
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10
net/xfrm/xfrm_output.c
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@ -27,10 +27,14 @@ static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
- skb_headroom(skb); - skb_headroom(skb);
int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
if (nhead > 0 || ntail > 0) if (nhead <= 0) {
return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); if (ntail <= 0)
return 0;
nhead = 0;
} else if (ntail < 0)
ntail = 0;
return 0; return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
} }
static int xfrm_output_one(struct sk_buff *skb, int err) static int xfrm_output_one(struct sk_buff *skb, int err)