Re: [PATCH] media: ttpci: fix two memleaks in budget_av_attach

[alexious@zju.edu.cn]

> On 06/02/2024 08:37, Zhipeng Lu wrote:
> > When saa7146_register_device and saa7146_vv_init fails, budget_av_attach
> > should free the resources it allocates, like the error-handling of
> > ttpci_budget_init does. Besides, there are two fixme comment refers to
> > such deallocations.
> > 
> > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
> > ---
> >  drivers/media/pci/ttpci/budget-av.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/media/pci/ttpci/budget-av.c b/drivers/media/pci/ttpci/budget-av.c
> > index 230b104a7cdf..4f897f848581 100644
> > --- a/drivers/media/pci/ttpci/budget-av.c
> > +++ b/drivers/media/pci/ttpci/budget-av.c
> > @@ -1463,7 +1463,8 @@ static int budget_av_attach(struct saa7146_dev *dev, struct saa7146_pci_extensio
> >  		budget_av->has_saa7113 = 1;
> >  		err = saa7146_vv_init(dev, &vv_data);
> >  		if (err != 0) {
> > -			/* fixme: proper cleanup here */
> > +			ttpci_budget_deinit(&budget_av->budget);
> > +			kfree(budget_av);
> >  			ERR("cannot init vv subsystem\n");
> >  			return err;
> >  		}
> > @@ -1472,7 +1473,8 @@ static int budget_av_attach(struct saa7146_dev *dev, struct saa7146_pci_extensio
> >  		vv_data.vid_ops.vidioc_s_input = vidioc_s_input;
> >  
> >  		if ((err = saa7146_register_device(&budget_av->vd, dev, "knc1", VFL_TYPE_VIDEO))) {
> > -			/* fixme: proper cleanup here */
> > +			ttpci_budget_deinit(&budget_av->budget);
> > +			kfree(budget_av);
> I think this should go after the saa7146_vv_release() release below.
> Just in case saa7146_vv_release() relies on budget_av somewhere. And
> besides, it is good practice to release resources in the reverse order
> they were allocated.

Yes, I noticed the order of `kfree(budget_av)` and `ttpci_budget_deinit`, 
but did forgot the `saa7146_vv_release`. I'll send a v2 version of this 
patch soon.

Regards,
Zhipeng

> 
> >  			ERR("cannot register capture v4l2 device\n");
> >  			saa7146_vv_release(dev);
> >  			return err;