netdev - Re: [PATCH net] sock: fix sg page frag coalescing in sk_alloc

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Date:   Mon, 23 Jul 2018 21:29:25 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     netdev@...r.kernel.org, davejwatson@...com, borisp@...lanox.com,
        john.fastabend@...il.com
Subject: Re: [PATCH net] sock: fix sg page frag coalescing in sk_alloc_sg

From: Daniel Borkmann <daniel@...earbox.net>
Date: Mon, 23 Jul 2018 22:37:54 +0200

> Current sg coalescing logic in sk_alloc_sg() (latter is used by tls and
> sockmap) is not quite correct in that we do fetch the previous sg entry,
> however the subsequent check whether the refilled page frag from the
> socket is still the same as from the last entry with prior offset and
> length matching the start of the current buffer is comparing always the
> first sg list entry instead of the prior one.
> 
> Fixes: 3c4d7559159b ("tls: kernel TLS support")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Dave Watson <davejwatson@...com>

Applied and queued up for -stable, thanks Daniel.