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[TCP]: Reset gso_segs if packet is dodgy

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I wasn't paranoid enough in verifying GSO information.  A bogus gso_segs
could upset drivers as much as a bogus header would.  Let's reset it in
the per-protocol gso_segment functions.

I didn't verify gso_size because that can be verified by the source of
the dodgy packets.

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 2006-06-29 20:11:25 -07:00 committed by David S. Miller
parent 598736c556
commit 3820c3f3e4
1 changed files with 10 additions and 4 deletions
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14
net/ipv4/tcp.c
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@ -2166,13 +2166,19 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
if (!pskb_may_pull(skb, thlen))
goto out;
segs = NULL;
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST))
goto out;
oldlen = (u16)~skb->len;
__skb_pull(skb, thlen);
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
/* Packet is from an untrusted source, reset gso_segs. */
int mss = skb_shinfo(skb)->gso_size;
skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss;
segs = NULL;
goto out;
}
segs = skb_segment(skb, features);
if (IS_ERR(segs))
goto out;