netdev - [PATCH net 0/2] zerocopy fixes

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Date:   Wed, 20 Dec 2017 17:37:48 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net 0/2] zerocopy fixes

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

The removal of UFO hardware offload support exposed a bug in
segmentation of zerocopy skbs.

The reference counting mechanism for msg_zerocopy was incorrectly
applied to vhost_net zerocopy packets.

The other issue observed through analysis. We do not cook skbs
with skb_zcopy(skb) but no frags, but this is possible in principle.
Correctly call skb_zcopy_clear on those.

Willem de Bruijn (2):
  skbuff: orphan frags before zerocopy clone
  skbuff: skb_copy_ubufs must release uarg even without user frags

 net/core/skbuff.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

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2.15.1.620.gb9897f4670-goog