linux-kernel - Re: [PATCH] watchdog: fix array may be out of bound

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Date:   Sun, 12 Dec 2021 20:03:33 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     zhangyue <zhangyue1@...inos.cn>, wim@...ux-watchdog.org
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: fix array may be out of bound

On 12/12/21 7:34 PM, zhangyue wrote:
> In this function, the param 'idx' may be
> equal to 'DW_WDT_NUM_TOPS'.
> At this time, the array 'dw_wdt->timeouts'
> may be out of bound
> 
> Signed-off-by: zhangyue <zhangyue1@...inos.cn>
> ---
>   drivers/watchdog/dw_wdt.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
> index cd578843277e..15fb1895c085 100644
> --- a/drivers/watchdog/dw_wdt.c
> +++ b/drivers/watchdog/dw_wdt.c
> @@ -155,6 +155,9 @@ static unsigned int dw_wdt_get_min_timeout(struct dw_wdt *dw_wdt)
>   			break;
>   	}
>   
> +	if (idx == DW_WDT_NUM_TOPS)
> +		return 1;
> +

Please look at the code (and the comments) more closely.
This can not happen.

Guenter