From: Eric Dumazet <eduma...@google.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 <eduma...@google.com>
> Diagnosed-by: Willem de Bruijn <will...@google.com>
Applied and queued up for -stable.
