linux-kernel - Re: [PATCH] comedi: drivers: ni_tio: Fix arithmetic expression overflow

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Message-ID: <2024011831-morphine-showroom-bc8f@gregkh>
Date: Thu, 18 Jan 2024 10:32:00 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Denis Arefev <arefev@...mel.ru>
Cc: Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	open list <linux-kernel@...r.kernel.org>,
	lvc-project@...uxtesting.org
Subject: Re: [PATCH] comedi: drivers: ni_tio: Fix arithmetic expression
 overflow

On Thu, Jan 18, 2024 at 10:36:19AM +0300, Denis Arefev wrote:
> The value of an arithmetic expression period_ns * 1000 is subject
> to overflow due to a failure to cast operands to a larger data
> type before performing arithmetic
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Reviewed-by: Ian Abbott <abbotti@....co.uk>
> Signed-off-by: Denis Arefev <arefev@...mel.ru>
> ---
>  drivers/comedi/drivers/ni_tio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/comedi/drivers/ni_tio.c b/drivers/comedi/drivers/ni_tio.c
> index da6826d77e60..acc914903c70 100644
> --- a/drivers/comedi/drivers/ni_tio.c
> +++ b/drivers/comedi/drivers/ni_tio.c
> @@ -800,7 +800,7 @@ static int ni_tio_set_clock_src(struct ni_gpct *counter,
>  				GI_PRESCALE_X2(counter_dev->variant) |
>  				GI_PRESCALE_X8(counter_dev->variant), bits);
>  	}
> -	counter->clock_period_ps = period_ns * 1000;
> +	counter->clock_period_ps = period_ns * 1000UL;

Can period_ns ever be "too big" to cause such an overflow?

And what commit id does this fix?

thanks,

greg k-h