linux-kernel - Re: [PATCH v2] staging: iio: frequency: ad9834: Validate frequency parameter value

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Message-ID: <59cc60a1-f6d6-4f9f-bc36-6b06315eaee4@suswa.mountain>
Date: Wed, 3 Jul 2024 18:29:43 +0200
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Aleksandr Mishin <amishin@...rgos.ru>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Datta Shubhrajyoti <shubhrajyoti@...com>, linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] staging: iio: frequency: ad9834: Validate frequency
 parameter value

On Wed, Jul 03, 2024 at 06:45:06PM +0300, Aleksandr Mishin wrote:
> In ad9834_write_frequency() clk_get_rate() can return 0. In such case
> ad9834_calc_freqreg() call will lead to division by zero. Checking
> 'if (fout > (clk_freq / 2))' doesn't protect in case of 'fout' is 0.
> ad9834_write_frequency() is called from ad9834_write(), where fout is
> taken from text buffer, which can contain any value.
> 
> Modify parameters checking.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 12b9d5bf76bf ("Staging: IIO: DDS: AD9833 / AD9834 driver")
> Suggested-by: Dan Carpenter <dan.carpenter@...aro.org>
> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
> ---
> v1->v2: Check if clk_freq == 0 directly instead of fout == 0
>  as suggested by Dan


Thanks!

Reviewed-by: Dan Carpenter <dan.carpenter@...aro.org>

regards,
dan carpenter