linux-kernel - RE: [PATCH 1/1] rpmsg: virtio_rpmsg_bus: Fix rpmsg_create

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Date:   Thu, 26 Jul 2018 07:04:23 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Suman Anna <s-anna@...com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>
CC:     "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Arnaud POULIQUEN" <arnaud.pouliquen@...com>,
        "benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>
Subject: RE: [PATCH 1/1] rpmsg: virtio_rpmsg_bus: Fix rpmsg_create_channel
 memory leak

Hi Suman,

> -----Original Message-----
> From: Suman Anna <s-anna@...com>
> Sent: Thursday, July 26, 2018 12:37 AM
> To: Loic PALLARDY <loic.pallardy@...com>; bjorn.andersson@...aro.org;
> ohad@...ery.com
> Cc: linux-remoteproc@...r.kernel.org; linux-kernel@...r.kernel.org;
> Arnaud POULIQUEN <arnaud.pouliquen@...com>;
> benjamin.gaignard@...aro.org
> Subject: Re: [PATCH 1/1] rpmsg: virtio_rpmsg_bus: Fix
> rpmsg_create_channel memory leak
> 
> Hi Loic,
> 
> On 07/25/2018 04:08 PM, Loic Pallardy wrote:
> > In case of rpmsg_register_device() failure, vch previously
> > allocated must be free.
> >
> 
> Isn't this already handled through the virtio_rpmsg_release_device()
> callback as part of the put_device() in rpmsg_register_device() failure.

Yes you're right, put_device() is doing the job.
Please forget this patch.

Regards,
Loic 

> 
> regards
> Suman
> 
> > fixes: 6eed598a0491 ("rpmsg: Split off generic tail of create_channel()")
> >
> > Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> > ---
> >  drivers/rpmsg/virtio_rpmsg_bus.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c
> b/drivers/rpmsg/virtio_rpmsg_bus.c
> > index 664f957..10f927e 100644
> > --- a/drivers/rpmsg/virtio_rpmsg_bus.c
> > +++ b/drivers/rpmsg/virtio_rpmsg_bus.c
> > @@ -431,8 +431,10 @@ static struct rpmsg_device
> *rpmsg_create_channel(struct virtproc_info *vrp,
> >  	rpdev->dev.parent = &vrp->vdev->dev;
> >  	rpdev->dev.release = virtio_rpmsg_release_device;
> >  	ret = rpmsg_register_device(rpdev);
> > -	if (ret)
> > +	if (ret) {
> > +		kfree(vch);
> >  		return NULL;
> > +	}
> >
> >  	return rpdev;
> >  }
> >