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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	stephen@networkplumber.org
Subject: Re: [PATCH net] vhost: correctly check the return value of translate_desc() in log_used()
Date: Fri, 15 Feb 2019 16:59:56 -0500	[thread overview]
Message-ID: <20190215165929-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20190215075324.18891-1-jasowang@redhat.com>

On Fri, Feb 15, 2019 at 03:53:24PM +0800, Jason Wang wrote:
> When fail, translate_desc() returns negative value, otherwise the
> number of iovs. So we should fail when the return value is negative
> instead of a blindly check against zero.
> 
> Reported-by: Stephen Hemminger <stephen@networkplumber.org>
> Fixes: cc5e71075947 ("vhost: log dirty page correctly")
> Signed-off-by: Jason Wang <jasowang@redhat.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

and I guess the log was backported to stable so we want
this backported too.

> ---
>  drivers/vhost/vhost.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index 24a129fcdd61..a2e5dc7716e2 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -1788,7 +1788,7 @@ static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len)
>  
>  	ret = translate_desc(vq, (uintptr_t)vq->used + used_offset,
>  			     len, iov, 64, VHOST_ACCESS_WO);
> -	if (ret)
> +	if (ret < 0)
>  		return ret;
>  
>  	for (i = 0; i < ret; i++) {
> -- 
> 2.17.1

  parent reply	other threads:[~2019-02-15 22:00 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-15  7:53 [PATCH net] vhost: correctly check the return value of translate_desc() in log_used() Jason Wang
2019-02-15 16:45 ` Stephen Hemminger
2019-02-15 16:45 ` Stephen Hemminger
2019-02-19  6:51   ` Jason Wang
2019-02-19  6:51   ` Jason Wang
2019-02-15 18:03 ` David Miller
2019-02-19  6:50   ` Jason Wang
2019-02-19  6:50   ` Jason Wang
2019-02-15 18:03 ` David Miller
2019-02-15 21:59 ` Michael S. Tsirkin
2019-02-15 21:59 ` Michael S. Tsirkin [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-02-15  7:53 Jason Wang

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