From: Dan Carpenter <dan.carpenter@linaro.org>
To: "Patrik Dahlström" <risca@dalakolonin.se>
Cc: Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH] iio: adc: palmas: fix off by one bugs
Date: Fri, 21 Apr 2023 13:41:56 +0300 [thread overview]
Message-ID: <14fee94a-7db7-4371-b7d6-e94d86b9561e@kili.mountain> (raw)
Valid values for "adc_chan" are zero to (PALMAS_ADC_CH_MAX - 1).
Smatch detects some buffer overflows caused by this:
drivers/iio/adc/palmas_gpadc.c:721 palmas_gpadc_read_event_value() error: buffer overflow 'adc->thresholds' 16 <= 16
drivers/iio/adc/palmas_gpadc.c:758 palmas_gpadc_write_event_value() error: buffer overflow 'adc->thresholds' 16 <= 16
The effect of this bug in other functions is more complicated but
obviously we should fix all of them.
Fixes: a99544c6c883 ("iio: adc: palmas: add support for iio threshold events")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
---
drivers/iio/adc/palmas_gpadc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index c1c439215aeb..7dfc9c927a23 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -547,7 +547,7 @@ static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
int adc_chan = chan->channel;
int ret = 0;
- if (adc_chan > PALMAS_ADC_CH_MAX)
+ if (adc_chan >= PALMAS_ADC_CH_MAX)
return -EINVAL;
mutex_lock(&adc->lock);
@@ -595,7 +595,7 @@ static int palmas_gpadc_read_event_config(struct iio_dev *indio_dev,
int adc_chan = chan->channel;
int ret = 0;
- if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
return -EINVAL;
mutex_lock(&adc->lock);
@@ -684,7 +684,7 @@ static int palmas_gpadc_write_event_config(struct iio_dev *indio_dev,
int adc_chan = chan->channel;
int ret;
- if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
return -EINVAL;
mutex_lock(&adc->lock);
@@ -710,7 +710,7 @@ static int palmas_gpadc_read_event_value(struct iio_dev *indio_dev,
int adc_chan = chan->channel;
int ret;
- if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
return -EINVAL;
mutex_lock(&adc->lock);
@@ -744,7 +744,7 @@ static int palmas_gpadc_write_event_value(struct iio_dev *indio_dev,
int old;
int ret;
- if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
return -EINVAL;
mutex_lock(&adc->lock);
--
2.39.2
next reply other threads:[~2023-04-21 10:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-21 10:41 Dan Carpenter [this message]
2023-04-23 13:11 ` Jonathan Cameron
2023-04-29 20:25 ` Patrik Dahlström
2023-05-01 15:06 ` Jonathan Cameron
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