This is a note to let you know that I've just added the patch titled

staging: iio: frequency: ad9834: Validate frequency parameter value

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From b48aa991758999d4e8f9296c5bbe388f293ef465 Mon Sep 17 00:00:00 2001 From: Aleksandr Mishin amishin@t-argos.ru Date: Wed, 3 Jul 2024 18:45:06 +0300 Subject: staging: iio: frequency: ad9834: Validate frequency parameter value

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@linaro.org Signed-off-by: Aleksandr Mishin amishin@t-argos.ru Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Link: https://patch.msgid.link/20240703154506.25584-1-amishin@t-argos.ru Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/staging/iio/frequency/ad9834.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c index a7a5cdcc6590..47e7d7e6d920 100644 --- a/drivers/staging/iio/frequency/ad9834.c +++ b/drivers/staging/iio/frequency/ad9834.c @@ -114,7 +114,7 @@ static int ad9834_write_frequency(struct ad9834_state *st,

clk_freq = clk_get_rate(st->mclk);

- if (fout > (clk_freq / 2)) + if (!clk_freq || fout > (clk_freq / 2)) return -EINVAL;

regval = ad9834_calc_freqreg(clk_freq, fout);