linux-kernel - [PATCH RFC v2 03/10] vringh: reset kiov 'consumed' field in __vringh

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Message-Id: <20210128144127.113245-4-sgarzare@redhat.com>
Date:   Thu, 28 Jan 2021 15:41:20 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Xie Yongji <xieyongji@...edance.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org
Subject: [PATCH RFC v2 03/10] vringh: reset kiov 'consumed' field in __vringh_iov()

__vringh_iov() overwrites the contents of riov and wiov, in fact it
resets the 'i' and 'used' fields, but also the consumed field should
be reset to avoid an inconsistent state.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 drivers/vhost/vringh.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index f68122705719..bee63d68201a 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -290,9 +290,9 @@ __vringh_iov(struct vringh *vrh, u16 i,
 		return -EINVAL;
 
 	if (riov)
-		riov->i = riov->used = 0;
+		riov->i = riov->used = riov->consumed = 0;
 	if (wiov)
-		wiov->i = wiov->used = 0;
+		wiov->i = wiov->used = wiov->consumed = 0;
 
 	for (;;) {
 		void *addr;
-- 
2.29.2