linux-kernel - Re: [PATCH v6 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings

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Date:   Tue, 20 Jun 2023 08:18:02 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Prathu Baronia <prathubaronia2011@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Khadija Kamran <kamrankhadijadj@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, error27@...il.com, lkp@...el.com,
        oe-kbuild-all@...ts.linux.dev, oe-kbuild@...ts.linux.dev
Subject: Re: [PATCH v6 1/2] axis-fifo: use devm_kasprintf() for allocating
 formatted strings

On Mon, Jun 19, 2023 at 09:52:44PM +0530, Prathu Baronia wrote:
> In various places, string buffers of a fixed size are allocated, and
> filled using snprintf() with the same fixed size, which is error-prone.
> 
> Replace this by calling devm_kasprintf() instead, which always uses the
> appropriate size.
> 
> Signed-off-by: Prathu Baronia <prathubaronia2011@...il.com>
> ---
> V5 -> V6: Split into api change and name change commits
> V4 -> V5: Remove the dev_info() and use a unique identifier for dev name
> V3 -> V4: Split into warning fixing and cleanup commits
> V2 -> V3: Fix smatch warnings from kernel test robot
> V1 -> V2: Split into logical commits and fix commit message
> 

> -	snprintf(device_name, 32, "%s_%pa", DRIVER_NAME, &r_mem->start);
                                      ^^^

> +	device_name = devm_kasprintf(dev, GFP_KERNEL, "%s_%p", DRIVER_NAME, &r_mem->start);
                                                          ^^

This is a sneaky fix which Greg already kind of complained about if I
remember correctly...

regards,
dan carpenter