netdev - Re: [PATCH net] tcp: do not recycle cloned skbs

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Message-Id: <20190515.092412.1272864626450901775.davem@davemloft.net>
Date:   Wed, 15 May 2019 09:24:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, willemb@...gle.com, eric.dumazet@...il.com
Subject: Re: [PATCH net] tcp: do not recycle cloned skbs

From: Eric Dumazet <edumazet@...gle.com>
Date: Wed, 15 May 2019 09:10:15 -0700

> It is illegal to change arbitrary fields in skb_shared_info if the
> skb is cloned.
> 
> Before calling skb_zcopy_clear() we need to ensure this rule,
> therefore we need to move the test from sk_stream_alloc_skb()
> to sk_wmem_free_skb()
> 
> Fixes: 4f661542a402 ("tcp: fix zerocopy and notsent_lowat issues")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Diagnosed-by: Willem de Bruijn <willemb@...gle.com>

Applied and queued up for -stable.