Re: [PATCH] vhost: Fix vhost_vq_reset()

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在 2021/3/12 下午10:09, Laurent Vivier 写道:
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@xxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  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;




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