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net: Fix header size check for GSO case in recvmsg (af_packet)

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Parameter 'len' is size_t type so it will never get negative.

Signed-off-by: Mariusz Kozlowski <mk@lab.zgora.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mariusz Kozlowski 2010-11-08 11:58:45 +00:00 committed by David S. Miller
parent 7c13a0d9a1
commit 1f18b7176e
1 changed files with 3 additions and 1 deletions
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4
net/packet/af_packet.c
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@ -1610,9 +1610,11 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
err = -EINVAL;
vnet_hdr_len = sizeof(vnet_hdr);
if ((len -= vnet_hdr_len) < 0)
if (len < vnet_hdr_len)
goto out_free;
len -= vnet_hdr_len;
if (skb_is_gso(skb)) {
struct skb_shared_info *sinfo = skb_shinfo(skb);