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

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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: 12b9d5bf76 ("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>
This commit is contained in:
Aleksandr Mishin 2024-07-03 18:45:06 +03:00 committed by Jonathan Cameron
parent 8400291e28
commit b48aa99175
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/iio/frequency/ad9834.c
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@ -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);