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SubjectRe: [PATCH] samples/vfio-mdev: don't return zero on failure paths in mtty_dev_init()
On Wed, 4 Jan 2017 17:52:30 +0530
Kirti Wankhede <kwankhede@nvidia.com> wrote:

> Dan Carpenter had sent similar change earlier.
> https://www.spinics.net/lists/kvm/msg141470.html
>
> Alex,
> Did you pull that change in your tree?

I had somehow missed Dan's patch. I'll apply Dan's with a Reported-by
credit for Alexey as well. Thanks,

Alex

> On 12/31/2016 4:10 AM, Alexey Khoroshilov wrote:
> > If class_create() or mdev_register_device() fail, mtty_dev_init()
> > breaks off initialization, deallocates all resources, but returns zero.
> >
> > The patch adds proper error code return values.
> >
> > Found by Linux Driver Verification project (linuxtesting.org).
> >
> > Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
> > ---
> > samples/vfio-mdev/mtty.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
> > index 6b633a4ea333..e9c52e1f97a6 100644
> > --- a/samples/vfio-mdev/mtty.c
> > +++ b/samples/vfio-mdev/mtty.c
> > @@ -1446,6 +1446,7 @@ static int __init mtty_dev_init(void)
> > mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME);
> >
> > if (IS_ERR(mtty_dev.vd_class)) {
> > + ret = PTR_ERR(mtty_dev.vd_class);
> > pr_err("Error: failed to register mtty_dev class\n");
> > goto failed1;
> > }
> > @@ -1458,7 +1459,8 @@ static int __init mtty_dev_init(void)
> > if (ret)
> > goto failed2;
> >
> > - if (mdev_register_device(&mtty_dev.dev, &mdev_fops) != 0)
> > + ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
> > + if (ret)
> > goto failed3;
> >
> > mutex_init(&mdev_list_lock);
> > @@ -1467,11 +1469,9 @@ static int __init mtty_dev_init(void)
> > goto all_done;
> >
> > failed3:
> > -
> > device_unregister(&mtty_dev.dev);
> > failed2:
> > class_destroy(mtty_dev.vd_class);
> > -
> > failed1:
> > cdev_del(&mtty_dev.vd_cdev);
> > unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK);
> >

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