Commit 35b99dff authored Dec 13, 2017 by Willem de Bruijn Committed by David S. Miller Dec 15, 2017

sock: free skb in skb_complete_tx_timestamp on error



skb_complete_tx_timestamp must ingest the skb it is passed. Call
kfree_skb if the skb cannot be enqueued.

Fixes: b245be1f ("net-timestamp: no-payload only sysctl")
Fixes: 9ac25fc0 ("net: fix socket refcounting in skb_complete_tx_timestamp()")
Reported-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d9356edc

net/core/skbuff.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -4293,7 +4293,7 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
		struct sock *sk = skb->sk;

		if (!skb_may_tx_timestamp(sk, false))
		return;
		goto err;

		/* Take a reference to prevent skb_orphan() from freeing the socket,
		* but only if the socket refcount is not zero.
		@@ -4302,7 +4302,11 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
		skb_hwtstamps(skb) = hwtstamps;
		__skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND, false);
		sock_put(sk);
		return;
		}

		err:
		kfree_skb(skb);
		}
		EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);