From: Jason Wang <jasowang@redhat.com>
To: Xianting Tian <xianting.tian@linux.alibaba.com>
Cc: mst <mst@redhat.com>,
virtualization <virtualization@lists.linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] virtio-pci: fix memory leak of vp_dev
Date: Fri, 7 Jan 2022 10:34:06 +0800 [thread overview]
Message-ID: <CACGkMEuW5po+v-fFPNH6wtVVXD84Bx0UWhe86sHFYXQM39OKRA@mail.gmail.com> (raw)
In-Reply-To: <20220106083123.4064853-1-xianting.tian@linux.alibaba.com>
On Thu, Jan 6, 2022 at 4:31 PM Xianting Tian
<xianting.tian@linux.alibaba.com> wrote:
>
> In virtio_pci_probe(), vp_dev will not be freed if it goes to
> "err_register" branch. fix it
>
> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
So we had this:
commit 33635bd976fb4c3ccf0cfbb81a8d29bb87760607
Author: weiping zhang <zhangweiping@didichuxing.com>
Date: Thu Dec 21 20:40:24 2017 +0800
virtio_pci: don't kfree device on register failure
As mentioned at drivers/base/core.c:
/*
* NOTE: _Never_ directly free @dev after calling this function, even
* if it returned an error! Always use put_device() to give up the
* reference initialized in this function instead.
*/
so we don't free vp_dev until vp_dev->vdev.dev.release be called.
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Any reason that the above fix is wrong?
Thanks
> ---
> drivers/virtio/virtio_pci_common.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index fdbde1db5..48b5ac15e 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -602,8 +602,7 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
> err_enable_device:
> if (reg_dev)
> put_device(&vp_dev->vdev.dev);
> - else
> - kfree(vp_dev);
> + kfree(vp_dev);
> return rc;
> }
>
> --
> 2.17.1
>
next prev parent reply other threads:[~2022-01-07 2:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-06 8:31 [PATCH] virtio-pci: fix memory leak of vp_dev Xianting Tian
2022-01-07 2:34 ` Jason Wang [this message]
2022-01-07 2:36 ` Xianting Tian
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