linux-kernel - Re: [PATCH] memory: gpmc: fix out of bounds read and dereference on gpmc

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Message-ID: <20210302084402.4qw7ltj4ivcoxs4t@kozik-lap>
Date:   Tue, 2 Mar 2021 09:44:02 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Roger Quadros <rogerq@...nel.org>,
        Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory: gpmc: fix out of bounds read and dereference on
 gpmc_cs[]

On Tue, Feb 23, 2021 at 07:38:21PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the array gpmc_cs is indexed by cs before it cs is range checked
> and the pointer read from this out-of-index read is dereferenced. Fix this
> by performing the range check on cs before the read and the following
> pointer dereference.
> 
> Addresses-Coverity: ("Negative array index read")
> Fixes: 186401937927 ("memory: gpmc: Move omap gpmc code to live under drivers")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/memory/omap-gpmc.c | 7 +++++--

Thanks, applied with Tony's ack and changed Fixes to 9ed7a776eb50 ("ARM:
OMAP2+: Fix support for multiple devices on a GPMC chip select"). 

Best regards,
Krzysztof