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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Pan Bian <bianpan2016@163.com>, Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH] pvcalls-front: fixes incorrect error handling
Date: Mon, 26 Nov 2018 15:31:39 -0500	[thread overview]
Message-ID: <1f765e81-ed89-d110-74b1-cc8029a4555f@oracle.com> (raw)
In-Reply-To: <1542852432-30019-1-git-send-email-bianpan2016@163.com>

On 11/21/18 9:07 PM, Pan Bian wrote:
> kfree() is incorrectly used to release the pages allocated by
> __get_free_page() and __get_free_pages(). Use the matching deallocators
> i.e., free_page() and free_pages(), respectively.
>
> Signed-off-by: Pan Bian <bianpan2016@163.com>
> ---
>  drivers/xen/pvcalls-front.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
> index 2f11ca7..77224d8 100644
> --- a/drivers/xen/pvcalls-front.c
> +++ b/drivers/xen/pvcalls-front.c
> @@ -385,8 +385,8 @@ static int create_active(struct sock_mapping *map, int *evtchn)
>  out_error:
>  	if (*evtchn >= 0)
>  		xenbus_free_evtchn(pvcalls_front_dev, *evtchn);
> -	kfree(map->active.data.in);
> -	kfree(map->active.ring);
> +	free_pages((unsigned long)map->active.data.in, PVCALLS_RING_ORDER);

Is map->active.data.in guaranteed to be NULL when entering this routine?

-boris

> +	free_page((unsigned long)map->active.ring);
>  	return ret;
>  }
>  



  reply	other threads:[~2018-11-26 20:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-22  2:07 Pan Bian
2018-11-26 20:31 ` Boris Ostrovsky [this message]
2018-11-27  0:58   ` [Xen-devel] " PanBian
2018-11-27 20:37     ` Stefano Stabellini
2018-11-27 20:57       ` Boris Ostrovsky
2018-11-27 21:08         ` Stefano Stabellini
2018-11-27 22:47           ` Boris Ostrovsky
2018-11-27 22:51             ` Stefano Stabellini
2018-11-29 16:54 ` Juergen Gross

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