linux-kernel - Re: [PATCH v3] memory: brcmstb_dpfe: fix array index out of bounds

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Message-ID: <20200822205633.GA8809@kozik-lap>
Date:   Sat, 22 Aug 2020 22:56:33 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Markus Mayer <mmayer@...adcom.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] memory: brcmstb_dpfe: fix array index out of bounds

On Sat, Aug 22, 2020 at 01:50:00PM -0700, Markus Mayer wrote:
> We would overrun the error_text array if we hit a TIMEOUT condition,
> because we were using the error code "ETIMEDOUT" (which is 110) as an
> array index.
> 
> We fix the problem by correcting the array index and by providing a
> function to retrieve error messages rather than accessing the array
> directly. The function includes a bounds check that prevents the array
> from being overrun.
> 
> This patch was prepared in response to
>     https://lkml.org/lkml/2020/8/18/505.
> 
> Signed-off-by: Markus Mayer <mmayer@...adcom.com>
> Acked-by: Florian Fainelli <f.fainelli@...il.com>
> Fixes: 2f330caff577 ("memory: brcmstb: Add driver for DPFE")
> Reported-by: Colin Ian King <colin.king@...onical.com>
> ---
> 
> Changes since v2:
>     - Added "Fixes:" and "Reported-by:"
>     - Fixed "From" address
>     - No changes to the code
> 
> Changes since v1:
>     - Added link of the coverity report to the commit message.
>     - Added Florian's ack.
>     - Removed second "const" from get_error_text() return type
>       (thanks to the kernel test robot).
> 
>  drivers/memory/brcmstb_dpfe.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)

"From" and SoB look good now.

Thanks, applied.

Best regards,
Krzysztof