linux-kernel - Re: [PATCH] leds: blinkm: avoid uninitialized data use

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Date:   Tue, 5 Dec 2017 21:30:50 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Jan-Simon Moeller <jansimon.moeller@....de>,
        Richard Purdie <rpurdie@...ys.net>, Pavel Machek <pavel@....cz>
Cc:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: blinkm: avoid uninitialized data use

Hi Arnd,

Thanks for the patch.

On 12/04/2017 03:45 PM, Arnd Bergmann wrote:
> gcc-8 reports missing error handling in blinkm_detect, when blinkm()
> fails, tmpargs[] is uninitialized:
> 
> drivers/leds/leds-blinkm.c: In function 'blinkm_detect':
> drivers/leds/leds-blinkm.c:555:6: error: 'tmpargs' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This adds a missing error checks.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/leds/leds-blinkm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/leds/leds-blinkm.c b/drivers/leds/leds-blinkm.c
> index d03ed6b4176b..851c1920b63c 100644
> --- a/drivers/leds/leds-blinkm.c
> +++ b/drivers/leds/leds-blinkm.c
> @@ -549,8 +549,12 @@ static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
>  	/* make sure the blinkM is balanced (read/writes) */
>  	while (count > 0) {
>  		ret = blinkm_write(client, BLM_GET_ADDR, NULL);
> +		if (ret)
> +			return ret;
>  		usleep_range(5000, 10000);
>  		ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
> +		if (ret)
> +			return ret;
>  		usleep_range(5000, 10000);
>  		if (tmpargs[0] == 0x09)
>  			count = 0;
> 

Applied.

-- 
Best regards,
Jacek Anaszewski