linux-kernel - Re: [PATCH v8 1/3] watchdog: wdat_wdt: Using the existing function to check parameter timeout

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

Date:   Tue, 26 Apr 2022 13:15:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Liu Xinpeng <liuxp11@...natelecom.cn>
Cc:     wim@...ux-watchdog.org, tzungbi@...nel.org,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/3] watchdog: wdat_wdt: Using the existing function
 to check parameter timeout

On Tue, Apr 26, 2022 at 10:53:28PM +0800, Liu Xinpeng wrote:
> If max_hw_heartbeat_ms is provided, the configured maximum timeout is not
> limited by it. The limit check in this driver therefore doesn't make much
> sense. Similar, the watchdog core ensures that minimum timeout limits are
> met if min_hw_heartbeat_ms is set. Using watchdog_timeout_invalid() makes
> more sense because it takes this into account.
> 
> Signed-off-by: Liu Xinpeng <liuxp11@...natelecom.cn>

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

> ---
>  drivers/watchdog/wdat_wdt.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
> index 195c8c004b69..df0865a61a70 100644
> --- a/drivers/watchdog/wdat_wdt.c
> +++ b/drivers/watchdog/wdat_wdt.c
> @@ -344,6 +344,7 @@ static int wdat_wdt_probe(struct platform_device *pdev)
>  	wdat->period = tbl->timer_period;
>  	wdat->wdd.min_hw_heartbeat_ms = wdat->period * tbl->min_count;
>  	wdat->wdd.max_hw_heartbeat_ms = wdat->period * tbl->max_count;
> +	wdat->wdd.min_timeout = 1;
>  	wdat->stopped_in_sleep = tbl->flags & ACPI_WDAT_STOPPED;
>  	wdat->wdd.info = &wdat_wdt_info;
>  	wdat->wdd.ops = &wdat_wdt_ops;
> @@ -450,8 +451,7 @@ static int wdat_wdt_probe(struct platform_device *pdev)
>  	 * watchdog properly after it has opened the device. In some cases
>  	 * the BIOS default is too short and causes immediate reboot.
>  	 */
> -	if (timeout * 1000 < wdat->wdd.min_hw_heartbeat_ms ||
> -	    timeout * 1000 > wdat->wdd.max_hw_heartbeat_ms) {
> +	if (watchdog_timeout_invalid(&wdat->wdd, timeout)) {
>  		dev_warn(dev, "Invalid timeout %d given, using %d\n",
>  			 timeout, WDAT_DEFAULT_TIMEOUT);
>  		timeout = WDAT_DEFAULT_TIMEOUT;
> -- 
> 2.23.0
>