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R. Silva" , Philipp Zabel Subject: Re: [PATCH 13/22] iio: dac: ad5686: fix input raw value check Message-ID: References: <20260422-ad5313r-iio-support-v1-0-ed7dca001d1b@analog.com> <20260422-ad5313r-iio-support-v1-13-ed7dca001d1b@analog.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260422-ad5313r-iio-support-v1-13-ed7dca001d1b@analog.com> On Wed, Apr 22, 2026 at 03:45:47PM +0100, Rodrigo Alencar via B4 Relay wrote: > From: Rodrigo Alencar > > Use in_range() to fix range check for input raw value, which is off by > one, i.e., for a 10-bit DAC the max valid value is 1023, but 1 << 10 > equals 1024, which passes the previous check, allowing an out-of-range > write. > > Signed-off-by: Rodrigo Alencar > --- I'll reply just to this one but it seems to apply to all "fixes" patches. They look like a real fix so I would expect to see a Fixes tag (as Andy suggested) and see those commits coming first in the series. Other than that, code looks good (for those patches) - Nuno Sá > drivers/iio/dac/ad5686.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c > index 19d791c655b7..07a944311f0e 100644 > --- a/drivers/iio/dac/ad5686.c > +++ b/drivers/iio/dac/ad5686.c > @@ -185,7 +185,7 @@ static int ad5686_write_raw(struct iio_dev *indio_dev, > > switch (mask) { > case IIO_CHAN_INFO_RAW: > - if (val > (1 << chan->scan_type.realbits) || val < 0) > + if (!in_range(val, 0, 1 << chan->scan_type.realbits)) > return -EINVAL; > > mutex_lock(&st->lock); > > -- > 2.43.0 > >