linux-kernel - Re: [PATCH] watchdog: davinci_wdt: fix error handling in davinci_wdt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <b08164bd-eef1-dae5-ebbd-a42ca55f46d9@roeck-us.net>
Date:   Fri, 23 Mar 2018 17:22:51 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH] watchdog: davinci_wdt: fix error handling in
 davinci_wdt_probe()

On 03/23/2018 02:36 PM, Alexey Khoroshilov wrote:
> clk_disable_unprepare() was added to one error path,
> but there is another one. The patch makes sure clk is
> disabled at the both of them.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/davinci_wdt.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
> index 3e4c592c239f..6c6594261cb7 100644
> --- a/drivers/watchdog/davinci_wdt.c
> +++ b/drivers/watchdog/davinci_wdt.c
> @@ -236,15 +236,22 @@ static int davinci_wdt_probe(struct platform_device *pdev)
>   
>   	wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   	davinci_wdt->base = devm_ioremap_resource(dev, wdt_mem);
> -	if (IS_ERR(davinci_wdt->base))
> -		return PTR_ERR(davinci_wdt->base);
> +	if (IS_ERR(davinci_wdt->base)) {
> +		ret = PTR_ERR(davinci_wdt->base);
> +		goto err_clk_disable;
> +	}
>   
>   	ret = watchdog_register_device(wdd);
> -	if (ret < 0) {
> -		clk_disable_unprepare(davinci_wdt->clk);
> +	if (ret) {
>   		dev_err(dev, "cannot register watchdog device\n");
> +		goto err_clk_disable;
>   	}
>   
> +	return 0;
> +
> +err_clk_disable:
> +	clk_disable_unprepare(davinci_wdt->clk);
> +
>   	return ret;
>   }
>   
>