linux-kernel - Re: [PATCH v2] iio: imu: adis16400: fix memory leak

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Date:   Sat, 21 Sep 2019 19:15:27 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "navid.emamdoost@...il.com" <navid.emamdoost@...il.com>,
        "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>,
        "emamd001@....edu" <emamd001@....edu>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "smccaman@....edu" <smccaman@....edu>,
        "kjlu@....edu" <kjlu@....edu>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>
Subject: Re: [PATCH v2] iio: imu: adis16400: fix memory leak

On Fri, 20 Sep 2019 06:46:05 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:

> On Thu, 2019-09-19 at 10:56 -0500, Navid Emamdoost wrote:
> > In adis_update_scan_mode_burst, if adis->buffer allocation fails release
> > the adis->xfer.
> > 
> > v2: set adis->xfer = NULL to avoid any potential double free.
> >   
> 
> Reviewed-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Applied to the fixes-togreg branch of iio.git.

Thanks,

Jonathan

> 
> > Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> > ---
> >  drivers/iio/imu/adis_buffer.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/imu/adis_buffer.c
> > b/drivers/iio/imu/adis_buffer.c
> > index 9ac8356d9a95..78fe83c1f4fe 100644
> > --- a/drivers/iio/imu/adis_buffer.c
> > +++ b/drivers/iio/imu/adis_buffer.c
> > @@ -35,8 +35,11 @@ static int adis_update_scan_mode_burst(struct iio_dev
> > *indio_dev,
> >  		return -ENOMEM;
> >  
> >  	adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
> > -	if (!adis->buffer)
> > +	if (!adis->buffer) {
> > +		kfree(adis->xfer);
> > +		adis->xfer = NULL;
> >  		return -ENOMEM;
> > +	}
> >  
> >  	tx = adis->buffer + burst_length;
> >  	tx[0] = ADIS_READ_REG(adis->burst->reg_cmd);