linux-kernel - Re: [PATCH v1] iio: adc: PAC1934: fix accessing out of bounds array index

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Message-ID: <20240428143215.3388426d@jic23-huawei>
Date: Sun, 28 Apr 2024 14:32:15 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Conor Dooley <conor.dooley@...rochip.com>, marius.cristea@...rochip.com,
 lars@...afoo.de, lgirdwood@...il.com, broonie@...nel.org,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 conor+dt@...nel.org
Subject: Re: [PATCH v1] iio: adc: PAC1934: fix accessing out of bounds array
 index

On Thu, 25 Apr 2024 16:36:19 +0100
Conor Dooley <conor@...nel.org> wrote:

> On Thu, Apr 25, 2024 at 01:22:45PM +0100, Conor Dooley wrote:
> > On Thu, Apr 25, 2024 at 02:42:32PM +0300, marius.cristea@...rochip.com wrote:  
> > > From: Marius Cristea <marius.cristea@...rochip.com>
> > > 
> > > Fix accessing out of bounds array index for average
> > > current and voltage measurements. The device itself has
> > > only 4 channels, but in sysfs there are "fake"
> > > channels for the average voltages and currents too.
> > > 
> > > Fixes: 0fb528c8255b: "iio: adc: adding support for PAC193x"
> > > Reported-by: Conor Dooley <conor.dooley@...rochip.com>
> > > Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>  
> 
> 
> Huh, this is an empty message. I intended to send some tags, but must
> not have saved the buffer.
> 
> Closes: https://lore.kernel.org/linux-iio/20240405-embellish-bonnet-ab5f10560d93@wendy/
> Tested-by: Conor Dooley <conor.dooley@...rochip.com>
Applied to the fixes-togreg branch of iio.git

Thanks,

Jonathan

> 
> Cheers,
> Conor.
> 
> > > ---
> > >  drivers/iio/adc/pac1934.c | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/drivers/iio/adc/pac1934.c b/drivers/iio/adc/pac1934.c
> > > index f751260605e4..456f12faa348 100644
> > > --- a/drivers/iio/adc/pac1934.c
> > > +++ b/drivers/iio/adc/pac1934.c
> > > @@ -787,6 +787,15 @@ static int pac1934_read_raw(struct iio_dev *indio_dev,
> > >  	s64 curr_energy;
> > >  	int ret, channel = chan->channel - 1;
> > >  
> > > +	/*
> > > +	 * For AVG the index should be between 5 to 8.
> > > +	 * To calculate PAC1934_CH_VOLTAGE_AVERAGE,
> > > +	 * respectively PAC1934_CH_CURRENT real index, we need
> > > +	 * to remove the added offset (PAC1934_MAX_NUM_CHANNELS).
> > > +	 */
> > > +	if (channel >= PAC1934_MAX_NUM_CHANNELS)
> > > +		channel = channel - PAC1934_MAX_NUM_CHANNELS;
> > > +
> > >  	ret = pac1934_retrieve_data(info, PAC1934_MIN_UPDATE_WAIT_TIME_US);
> > >  	if (ret < 0)
> > >  		return ret;
> > > 
> > > base-commit: b80ad8e3cd2712b78b98804d1f59199680d8ed91
> > > -- 
> > > 2.34.1
> > >   
> 
>