linux-kernel - Re: [PATCH] UBI: Don't use signed int as array index before testing if it is negative

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Date:	Sat, 04 Aug 2007 12:16:22 +0300
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] UBI: Don't use signed int as array index before
	testing if it is negative

On Sat, 2007-08-04 at 01:25 +0200, Jesper Juhl wrote:
> Hi,
> 
> I can't find anything guaranteeing that 'ubi_num' cannot be <0 in 
> drivers/mtd/ubi/kapi.c::ubi_open_volume(), and in fact the code 
> even tests for that and errors out if so. Unfortunately the test 
> for "ubi_num < 0" happens after we've already used 'ubi_num' as 
> an array index - bad thing to do if it is negative.
> This patch moves the test earlier in the function and then moves 
> the indexing using that variable after the check. A bit safer :-) 
> 
> 
> Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>

Thanks for the catch, committed to UBI git tree.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

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