linux-kernel - Re: [PATCH] vringh: Use wiov->used to check for read/write desc order

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Message-ID: <1d7f1fb3-b22c-1ca9-0635-be3f14b97c4a@redhat.com>
Date:   Wed, 23 Jun 2021 11:21:19 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Neeraj Upadhyay <neeraju@...eaurora.org>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vringh: Use wiov->used to check for read/write desc order


在 2021/6/22 下午7:37, Neeraj Upadhyay 写道:
> As iov->used is incremented when descriptors are processed
> in __vringh_iov(), use it to check for incorrect read
> and write descriptor order.
>
> Signed-off-by: Neeraj Upadhyay <neeraju@...eaurora.org>


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


> ---
>   drivers/vhost/vringh.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> index 4af8fa2..14e2043 100644
> --- a/drivers/vhost/vringh.c
> +++ b/drivers/vhost/vringh.c
> @@ -359,7 +359,7 @@ __vringh_iov(struct vringh *vrh, u16 i,
>   			iov = wiov;
>   		else {
>   			iov = riov;
> -			if (unlikely(wiov && wiov->i)) {
> +			if (unlikely(wiov && wiov->used)) {
>   				vringh_bad("Readable desc %p after writable",
>   					   &descs[i]);
>   				err = -EINVAL;