Patch "sock: free skb in skb_complete_tx_timestamp on error" has been added to the 4.14-stable tree

Patch "sock: free skb in skb_complete_tx_timestamp on error" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sock: free skb in skb_complete_tx_timestamp on error

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sock-free-skb-in-skb_complete_tx_timestamp-on-error.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Sun Dec 31 11:12:48 CET 2017
From: Willem de Bruijn <willemb@google.com>
Date: Wed, 13 Dec 2017 14:41:06 -0500
Subject: sock: free skb in skb_complete_tx_timestamp on error

From: Willem de Bruijn <willemb@google.com>


[ 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>
---
 net/core/skbuff.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4296,7 +4296,7 @@ void skb_complete_tx_timestamp(struct sk
 	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.
@@ -4305,7 +4305,11 @@ void skb_complete_tx_timestamp(struct sk
 		*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);
 


Patches currently in stable-queue which might be from willemb@google.com are

queue-4.14/skbuff-skb_copy_ubufs-must-release-uarg-even-without-user-frags.patch
queue-4.14/sock-free-skb-in-skb_complete_tx_timestamp-on-error.patch
queue-4.14/skbuff-orphan-frags-before-zerocopy-clone.patch
queue-4.14/skbuff-in-skb_copy_ubufs-unclone-before-releasing-zerocopy.patch