linux-kernel - Re: [PATCH] hv: use correct order when freeing monitor

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Date:	Wed, 28 May 2014 11:23:01 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	devel@...uxdriverproject.org
Subject: Re: [PATCH] hv: use correct order when freeing monitor_pages

On 05/28/2014 01:16 AM, Radim Krčmář wrote:
> We try to free two pages when only one has been allocated.
> Cleanup path is unlikely, so I haven't found any trace that would fit,
> but I hope that free_pages_prepare() does catch it.
>
> Cc: stable@...r.kernel.org
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  Cc'd stable because the worst-case looks hard to debug.
>  Btw. the module can't get unloaded after we successfully connect?
>
>  drivers/hv/connection.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
> index 7f10c15..e84f452 100644
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -224,8 +224,8 @@ cleanup:
>  		vmbus_connection.int_page = NULL;
>  	}
>  
> -	free_pages((unsigned long)vmbus_connection.monitor_pages[0], 1);
> -	free_pages((unsigned long)vmbus_connection.monitor_pages[1], 1);
> +	free_pages((unsigned long)vmbus_connection.monitor_pages[0], 0);
> +	free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0);
>  	vmbus_connection.monitor_pages[0] = NULL;
>  	vmbus_connection.monitor_pages[1] = NULL;
>  

Acked-by: Jason Wang <jasowang@...hat.com>
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