linux-kernel - Re: [PATCH] dmaengine: idxd: Fix memory leak in idxd

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Date:   Fri, 16 Sep 2022 09:16:54 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: idxd: Fix memory leak in idxd_alloc()

On Fri, Sep 16, 2022 at 08:49:25AM -0700, Dave Jiang wrote:
> 
> On 9/16/2022 8:36 AM, Jerry Snitselaar wrote:
> > On Wed, Sep 14, 2022 at 08:08:14PM -0300, Rafael Mendonca wrote:
> > > If the IDA id allocation fails, then the allocated memory for the
> > > idxd_device struct doesn't get freed before returning NULL, which leads to
> > > a memleak.
> > > 
> > > Fixes: 47c16ac27d4c ("dmaengine: idxd: fix idxd conf_dev 'struct device' lifetime")
> > > Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
> > I think there needs to be a kfree(idxd) where it checks rc < 0 after the call to dev_set_name() as well, yes?
> The idxd_conf_device_release() should take care of freeing idxd with the
> put_device(). So I think we are good here.

Ah, right. Thanks.

Jerry

> > 
> > Regards,
> > Jerry
> > 
> > > ---
> > >   drivers/dma/idxd/init.c | 4 +++-
> > >   1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
> > > index aa3478257ddb..fdc97519b8fb 100644
> > > --- a/drivers/dma/idxd/init.c
> > > +++ b/drivers/dma/idxd/init.c
> > > @@ -445,8 +445,10 @@ static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_d
> > >   	idxd->data = data;
> > >   	idxd_dev_set_type(&idxd->idxd_dev, idxd->data->type);
> > >   	idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL);
> > > -	if (idxd->id < 0)
> > > +	if (idxd->id < 0) {
> > > +		kfree(idxd);
> > >   		return NULL;
> > > +	}
> > >   	device_initialize(conf_dev);
> > >   	conf_dev->parent = dev;
> > > -- 
> > > 2.34.1
> > >