Commit 5e52fffb authored by Jamie Bainbridge's avatar Jamie Bainbridge Committed by Greg Kroah-Hartman

ipv6: check raw payload size correctly in ioctl

[ Upstream commit 105f5528 ]

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: default avatarJamie Bainbridge <jbainbri@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent befb9254
...@@ -1144,8 +1144,7 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) ...@@ -1144,8 +1144,7 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
spin_lock_bh(&sk->sk_receive_queue.lock); spin_lock_bh(&sk->sk_receive_queue.lock);
skb = skb_peek(&sk->sk_receive_queue); skb = skb_peek(&sk->sk_receive_queue);
if (skb) if (skb)
amount = skb_tail_pointer(skb) - amount = skb->len;
skb_transport_header(skb);
spin_unlock_bh(&sk->sk_receive_queue.lock); spin_unlock_bh(&sk->sk_receive_queue.lock);
return put_user(amount, (int __user *)arg); return put_user(amount, (int __user *)arg);
} }
......
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