The phase register for the AD9834 is 12 bits, which means the valid
phase values range from 0 to 4095 (2^12 - 1). The current check uses a
greater-than condition with BIT(12), which equals 4096. This allows an
invalid phase value of 4096 to pass.
This patch corrects the check to use greater-than-or-equal-to, ensuring
that only phase values within the valid range are accepted.
Fixes: f1d05b5f68cb ("Staging: iio: Prefer using the BIT macro")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Zicheng Qu <quzicheng@xxxxxxxxxx>
---
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 47e7d7e6d920..6e99e008c5f4 100644
--- a/drivers/staging/iio/frequency/ad9834.c
+++ b/drivers/staging/iio/frequency/ad9834.c
@@ -131,7 +131,7 @@ static int ad9834_write_frequency(struct ad9834_state *st,
static int ad9834_write_phase(struct ad9834_state *st,
unsigned long addr, unsigned long phase)
{
- if (phase > BIT(AD9834_PHASE_BITS))
+ if (phase >= BIT(AD9834_PHASE_BITS))
return -EINVAL;
st->data = cpu_to_be16(addr | phase);
--
2.34.1
