netdev - Re: [net PATCH] net: tls, fix sk_write_space NULL write when tx disabled

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Date:   Thu, 15 Aug 2019 12:41:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     john.fastabend@...il.com
Cc:     jakub.kicinski@...ronome.com, ying.xue@...driver.com,
        netdev@...r.kernel.org, andreyknvl@...gle.com
Subject: Re: [net PATCH] net: tls, fix sk_write_space NULL write when tx
 disabled

From: John Fastabend <john.fastabend@...il.com>
Date: Wed, 14 Aug 2019 05:31:54 +0000

> The ctx->sk_write_space pointer is only set when TLS tx mode is enabled.
> When running without TX mode its a null pointer but we still set the
> sk sk_write_space pointer on close().
> 
> Fix the close path to only overwrite sk->sk_write_space when the current
> pointer is to the tls_write_space function indicating the tls module should
> clean it up properly as well.
> 
> Reported-by: Hillf Danton <hdanton@...a.com>
> Cc: Ying Xue <ying.xue@...driver.com>
> Cc: Andrey Konovalov <andreyknvl@...gle.com>
> Fixes: 57c722e932cfb ("net/tls: swap sk_write_space on close")
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Applied, thanks John.

That Fixes tag takes one through an interesting chain of fixes to fixes.
I'll queue this up for -stable and make sure it all ends up in the
proper place.

Thanks.