linux-kernel - Re: [PATCH] iio: core: fix memleak in iio_device_register

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Message-ID: <20231217132800.27e83a01@jic23-huawei>
Date: Sun, 17 Dec 2023 13:28:00 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Dinghao Liu <dinghao.liu@....edu.cn>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Alexandru Ardelean
 <alexandru.ardelean@...log.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: core: fix memleak in iio_device_register_sysfs

On Sun, 10 Dec 2023 13:32:28 +0000
Jonathan Cameron <jic23@...nel.org> wrote:

> On Fri,  8 Dec 2023 15:31:19 +0800
> Dinghao Liu <dinghao.liu@....edu.cn> wrote:
> 
> > When iio_device_register_sysfs_group() fails, we should
> > free iio_dev_opaque->chan_attr_group.attrs to prevent
> > potential memleak.
> > 
> > Fixes: 32f171724e5c ("iio: core: rework iio device group creation")
> > Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>  
> Hi.
> 
> Looks good to me, but I'd like to leave this one on the list a little
> longer to see if anyone else has comments.
> 
Guess no comments!

Applied to the fixes-togreg branch of iio.git.  I might not get another
fixes request out far enough in advance of the merge window in which case
this will go in around then instead.

Also marked for stable

Jonathan

> Jonathan
> 
> > ---
> >  drivers/iio/industrialio-core.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> > index c77745b594bd..e6d3d07a4c83 100644
> > --- a/drivers/iio/industrialio-core.c
> > +++ b/drivers/iio/industrialio-core.c
> > @@ -1581,10 +1581,13 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
> >  	ret = iio_device_register_sysfs_group(indio_dev,
> >  					      &iio_dev_opaque->chan_attr_group);
> >  	if (ret)
> > -		goto error_clear_attrs;
> > +		goto error_free_chan_attrs;
> >  
> >  	return 0;
> >  
> > +error_free_chan_attrs:
> > +	kfree(iio_dev_opaque->chan_attr_group.attrs);
> > +	iio_dev_opaque->chan_attr_group.attrs = NULL;
> >  error_clear_attrs:
> >  	iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
> >    
> 
>