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iio: adc: ti-ads1298: prevent divide by zero in ads1298_set_samp_freq()

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The "val" variable comes from the user so we need to ensure that it's not
zero.  In fact, all negative values are invalid as well.  Add a check for
that.

Fixes: 00ef7708fa ("iio: adc: ti-ads1298: Add driver")
Acked-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/c32c9087-86de-423b-8101-67b4a7f9d728@moroto.mountain
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Dan Carpenter 2024-02-22 09:15:37 +03:00 committed by Jonathan Cameron
parent debabbb1f2
commit df62153046
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/adc/ti-ads1298.c
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@ -258,6 +258,8 @@ static int ads1298_set_samp_freq(struct ads1298_private *priv, int val)
rate = ADS1298_CLK_RATE_HZ;
if (!rate)
return -EINVAL;
if (val <= 0)
return -EINVAL;
factor = (rate >> ADS1298_SHIFT_DR_HR) / val;
if (factor >= BIT(ADS1298_SHIFT_DR_LP))