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@xxxxxxxxxx>
Signed-off-by: Aleksandr Mishin <amishin@xxxxxxxxxx>
---
v1->v2: Check if clk_freq == 0 directly instead of fout == 0
as suggested by Dan
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);
--
2.30.2
