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ipv6: check raw payload size correctly in ioctl

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[ Upstream commit 105f5528b9 ]

In situations where an skb is paged, the transport header pointer and
tail pointer can be the same because the skb contents are in frags.

This results in ioctl(SIOCINQ/FIONREAD) incorrectly returning a
length of 0 when the length to receive is actually greater than zero.

skb->len is already correctly set in ip6_input_finish() with
pskb_pull(), so use skb->len as it always returns the correct result
for both linear and paged data.

Signed-off-by: Jamie Bainbridge <jbainbri@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jamie Bainbridge
2017-04-26 10:43:27 +10:00
committed by Greg Kroah-Hartman
parent befb925424
commit 5e52fffbb1
1 changed files with 1 additions and 2 deletions
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3
net/ipv6/raw.c
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@@ -1144,8 +1144,7 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
spin_lock_bh(&sk->sk_receive_queue.lock);
skb = skb_peek(&sk->sk_receive_queue);
if (skb)
amount = skb_tail_pointer(skb) -
skb_transport_header(skb);
amount = skb->len;
spin_unlock_bh(&sk->sk_receive_queue.lock);
return put_user(amount, (int __user *)arg);
}