sock: free skb in skb_complete_tx_timestamp on error

[ Upstream commit 35b99dffc3f710cafceee6c8c6ac6a98eb2cb4bf ]

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

Fixes: b245be1f4db1 ("net-timestamp: no-payload only sysctl")
Fixes: 9ac25fc06375 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index aec5605..a645155 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3823,7 +3823,7 @@ 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.
@@ -3832,7 +3832,11 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
                *skb_hwtstamps(skb) = *hwtstamps;
                __skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND);
                sock_put(sk);
+               return;
        }
+
+err:
+       kfree_skb(skb);
 }
 EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);