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tuntap: reset network header before calling skb_get_rxhash()

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Commit 499744209b (tuntap: dont use skb after netif_rx_ni(skb))
introduced another bug.

skb_get_rxhash() needs to access the network header, and it was
set for us in netif_rx_ni().

We need to reset network header or else skb_flow_dissect() behavior
is out of control.

Reported-and-tested-by: Kirill A. Shutemov <kirill@shutemov.name>
Tested-by: Daniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-12-17 04:39:20 +00:00 committed by David S. Miller
parent df48419107
commit 76fe45812a
1 changed files with 1 additions and 0 deletions
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drivers/net/tun.c
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@ -1199,6 +1199,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
}
skb_reset_network_header(skb);
rxhash = skb_get_rxhash(skb);
netif_rx_ni(skb);