linux-kernel - Re: [PATCH] [MTD] mtdchar.c: Fix regression in MEMGETREGIONINFO ioctl()

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Message-Id: <1220289903.2982.92.camel@pmac.infradead.org>
Date:	Mon, 01 Sep 2008 18:25:03 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Zev Weiss <zevweiss@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Rodolfo Giometti <giometti@...eenne.com>
Subject: Re: [PATCH] [MTD] mtdchar.c: Fix regression in
	MEMGETREGIONINFO	ioctl()

On Mon, 2008-09-01 at 05:19 -0700, Zev Weiss wrote:
> From: Zev Weiss <zevweiss@...il.com>
> Date: Mon, 1 Sep 2008 05:02:12 -0700
> Subject: [PATCH] [MTD] mtdchar.c: Fix regression in MEMGETREGIONINFO ioctl()
> 
> The MEMGETREGIONINFO ioctl() in mtdchar.c was clobbering user memory by
> overwriting more than intended, due the size of struct mtd_erase_region_info
> changing in commit 0ecbc81adfcb9f15f86b05ff576b342ce81bbef8.
> 
> Fix avoids this by copying struct members one by one with put_user(), as there
> is no longer a convenient struct to use the size of as the length argument to
> copy_to_user().
> 
> Signed-off-by: Zev Weiss <zevweiss@...il.com>

Thanks. Your patch was whitespace-damaged, but I managed to apply it
anyway. Please check for future patches though -- try sending patches to
yourself and then see if they get mangled. I believe gmail is known to
be broken unless you submit mail with SMTP.

I also try to avoid the pointless types like 'u32' in MTD code -- the C
language has perfectly good explicitly sized types; let's use them.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation



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