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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Roger Quadros <rogerq@kernel.org>,
	Tony Lindgren <tony@atomide.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	linux-omap@vger.kernel.org, kernel-janitors@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] memory: gpmc: fix out of bounds read and dereference on gpmc_cs[]
Date: Wed, 24 Feb 2021 10:55:52 +0300	[thread overview]
Message-ID: <20210224075552.GS2087@kadam> (raw)
In-Reply-To: <20210223193821.17232-1-colin.king@canonical.com>

On Tue, Feb 23, 2021 at 07:38:21PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.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@canonical.com>
> ---
>  drivers/memory/omap-gpmc.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
> index cfa730cfd145..f80c2ea39ca4 100644
> --- a/drivers/memory/omap-gpmc.c
> +++ b/drivers/memory/omap-gpmc.c
> @@ -1009,8 +1009,8 @@ EXPORT_SYMBOL(gpmc_cs_request);
>  
>  void gpmc_cs_free(int cs)
>  {
> -	struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
> -	struct resource *res = &gpmc->mem;

There is no actual dereferencing going on here, it just taking the
addresses.  But the patch is also harmless and improves readability.

regards,
dan carpenter


  parent reply	other threads:[~2021-02-24  7:56 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 19:38 Colin King
2021-02-23 19:52 ` Krzysztof Kozlowski
2021-02-24  7:55 ` Dan Carpenter [this message]
2021-02-24  8:11   ` Krzysztof Kozlowski
2021-02-25 12:37     ` Tony Lindgren
2021-02-24  8:46   ` Colin Ian King
2021-03-02  8:44 ` Krzysztof Kozlowski
2021-03-02  8:54   ` Colin Ian King

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