Subject: Re: [patch 2/2] vhost: fix return code for log_access_ok()

From: "Michael S. Tsirkin" <[email-masked]>
Date: Tue, 12 Oct 2010 14:28:24 +0200

On Mon, Oct 11, 2010 at 07:24:19PM +0200, Dan Carpenter wrote:
> access_ok() returns 1 if it's OK otherwise it should return 0.
> 
> Signed-off-by: Dan Carpenter <[email-masked]>

Good catch, thanks!
Acked-by: Michael S. Tsirkin <[email-masked]>

> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index c2aa12c..f82fe57 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -371,7 +371,7 @@ static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
>  	/* Make sure 64 bit math will not overflow. */
>  	if (a > ULONG_MAX - (unsigned long)log_base ||
>  	    a + (unsigned long)log_base > ULONG_MAX)
> -		return -EFAULT;
> +		return 0;
>  
>  	return access_ok(VERIFY_WRITE, log_base + a,
>  			 (sz + VHOST_PAGE_SIZE * 8 - 1) / VHOST_PAGE_SIZE / 8);