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From: Laurent Vivier <lvivier@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org,
	Jason Wang <jasowang@redhat.com>,
	netdev@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
	kvm@vger.kernel.org
Subject: [PATCH] vhost: Fix vhost_vq_reset()
Date: Fri, 12 Mar 2021 15:09:13 +0100	[thread overview]
Message-ID: <20210312140913.788592-1-lvivier@redhat.com> (raw)

vhost_reset_is_le() is vhost_init_is_le(), and in the case of
cross-endian legacy, vhost_init_is_le() depends on vq->user_be.

vq->user_be is set by vhost_disable_cross_endian().

But in vhost_vq_reset(), we have:

    vhost_reset_is_le(vq);
    vhost_disable_cross_endian(vq);

And so user_be is used before being set.

To fix that, reverse the lines order as there is no other dependency
between them.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 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 a262e12c6dc2..5ccb0705beae 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -332,8 +332,8 @@ static void vhost_vq_reset(struct vhost_dev *dev,
 	vq->error_ctx = NULL;
 	vq->kick = NULL;
 	vq->log_ctx = NULL;
-	vhost_reset_is_le(vq);
 	vhost_disable_cross_endian(vq);
+	vhost_reset_is_le(vq);
 	vq->busyloop_timeout = 0;
 	vq->umem = NULL;
 	vq->iotlb = NULL;
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Laurent Vivier <lvivier@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: [PATCH] vhost: Fix vhost_vq_reset()
Date: Fri, 12 Mar 2021 15:09:13 +0100	[thread overview]
Message-ID: <20210312140913.788592-1-lvivier@redhat.com> (raw)

vhost_reset_is_le() is vhost_init_is_le(), and in the case of
cross-endian legacy, vhost_init_is_le() depends on vq->user_be.

vq->user_be is set by vhost_disable_cross_endian().

But in vhost_vq_reset(), we have:

    vhost_reset_is_le(vq);
    vhost_disable_cross_endian(vq);

And so user_be is used before being set.

To fix that, reverse the lines order as there is no other dependency
between them.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 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 a262e12c6dc2..5ccb0705beae 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -332,8 +332,8 @@ static void vhost_vq_reset(struct vhost_dev *dev,
 	vq->error_ctx = NULL;
 	vq->kick = NULL;
 	vq->log_ctx = NULL;
-	vhost_reset_is_le(vq);
 	vhost_disable_cross_endian(vq);
+	vhost_reset_is_le(vq);
 	vq->busyloop_timeout = 0;
 	vq->umem = NULL;
 	vq->iotlb = NULL;
-- 
2.29.2

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

             reply	other threads:[~2021-03-12 14:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-12 14:09 Laurent Vivier [this message]
2021-03-12 14:09 ` [PATCH] vhost: Fix vhost_vq_reset() Laurent Vivier
2021-03-15  8:31 ` Jason Wang
2021-03-15  8:31   ` Jason Wang
2021-03-17  8:26 ` Stefano Garzarella
2021-03-17  8:26   ` Stefano Garzarella

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