linux-kernel - [PATCH AUTOSEL 4.19 596/671] vhost/test: stop device before reset

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Message-Id: <20200116170509.12787-333-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 12:03:54 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Sasha Levin <sashal@...nel.org>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 596/671] vhost/test: stop device before reset

From: "Michael S. Tsirkin" <mst@...hat.com>

[ Upstream commit 245cdd9fbd396483d501db83047116e2530f245f ]

When device stop was moved out of reset, test device wasn't updated to
stop before reset, this resulted in a use after free.  Fix by invoking
stop appropriately.

Fixes: b211616d7125 ("vhost: move -net specific code out")
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vhost/test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index a9be2d8e98df..55090d9f9de0 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -162,6 +162,7 @@ static int vhost_test_release(struct inode *inode, struct file *f)
 
 	vhost_test_stop(n, &private);
 	vhost_test_flush(n);
+	vhost_dev_stop(&n->dev);
 	vhost_dev_cleanup(&n->dev);
 	/* We do an extra flush before freeing memory,
 	 * since jobs can re-queue themselves. */
@@ -238,6 +239,7 @@ static long vhost_test_reset_owner(struct vhost_test *n)
 	}
 	vhost_test_stop(n, &priv);
 	vhost_test_flush(n);
+	vhost_dev_stop(&n->dev);
 	vhost_dev_reset_owner(&n->dev, umem);
 done:
 	mutex_unlock(&n->dev.mutex);
-- 
2.20.1