linux-kernel - Re: [PATCH 02/11] persistent_ram: Fix buffer size clamping during writes

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Message-ID: <20120513165601.GC16984@mwanda>
Date:	Sun, 13 May 2012 19:56:01 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	patches@...aro.org, Marco Stornelli <marco.stornelli@...il.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, arve@...roid.com,
	Jesper Juhl <jj@...osbits.net>,
	John Stultz <john.stultz@...aro.org>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kernel-team@...roid.com, Thomas Meyer <thomas@...3r.de>
Subject: Re: [PATCH 02/11] persistent_ram: Fix buffer size clamping during
 writes

On Fri, May 11, 2012 at 05:17:17PM -0700, Anton Vorontsov wrote:
> This is a longstanding bug, almost unnoticeable when calling
> persistent_ram_write() for small buffers.
> 
> But when called for large data buffers, the write routine behaves
> incorrectly, as the size may never update: instead of clamping
> the size to the maximum buffer size, buffer_size_add_clamp() returns
> an error (which is never checked by the write routine, btw).
> 
> To fix this, we now use buffer_size_add() that actually clamps the
> size to the max value.
> 
> Also remove buffer_size_add_clamp(), it is no longer needed.
> 

Say if you did notice it, what would that look like?  It's just that
something gets lost instead of written to the screen right?

regards,
dan carpenter


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