From: Jamie Bainbridge <jbain...@redhat.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ Upstream commit 105f5528b9bbaa08b526d3405a5bcd2ff0c953c8 ]
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 <jbain...@redhat.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
---
net/ipv6/raw.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index c2afb29dc1d7..581662201ba9 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1145,8 +1145,7 @@ 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 != NULL)
- 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);
}
--
2.12.2
