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

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Jan 18, 2024 at 03:37:47PM +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.
> 
> Fixes: 3e90b1c7ebe9 ("staging: comedi: ni_tio: tidy up ni_tio_set_clock_src() and helpers")
> Cc: <stable@vger.kernel.org> # v5.15+ 
> Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
> Signed-off-by: Denis Arefev <arefev@swemel.ru>
> Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
> ---
>  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;
>  	ni_tio_set_sync_mode(counter);
>  	return 0;
>  }
> -- 
> 2.25.1
> 
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
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