linux-kernel - Re: [PATCH 10/11] tcp: Always set options to 0 before calling tcp_established

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Date:	Wed, 02 Oct 2013 16:33:26 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	linux-kernel@...r.kernel.org, ak@...ux.intel.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH 10/11] tcp: Always set options to 0 before calling
 tcp_established_options

From: Andi Kleen <andi@...stfloor.org>
Date: Mon, 30 Sep 2013 13:29:11 -0700

> From: Andi Kleen <ak@...ux.intel.com>
> 
> tcp_established_options assumes opts->options is 0 before calling,
> as it read modify writes it.
> 
> For the tcp_current_mss() case the opts structure is not zeroed,
> so this can be done with uninitialized values.
> 
> This is ok, because ->options is not read in this path.
> But it's still better to avoid the operation on the uninitialized
> field. This shuts up a static code analyzer, and presumably
> may help the optimizer.
> 
> Cc: netdev@...r.kernel.org
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Applied.
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