linux-kernel - [PATCH 5.10 029/120] um: virtio: free vu_dev only with the contained struct device

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Date:   Mon,  8 Feb 2021 16:00:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johannes Berg <johannes.berg@...el.com>,
        Richard Weinberger <richard@....at>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 029/120] um: virtio: free vu_dev only with the contained struct device

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit f4172b084342fd3f9e38c10650ffe19eac30d8ce ]

Since struct device is refcounted, we shouldn't free the vu_dev
immediately when it's removed from the platform device, but only
when the references actually all go away. Move the freeing to
the release to accomplish that.

Fixes: 5d38f324993f ("um: drivers: Add virtio vhost-user driver")
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/um/drivers/virtio_uml.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index a6c4bb6c2c012..c17b8e5ec1869 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -1083,6 +1083,7 @@ static void virtio_uml_release_dev(struct device *d)
 	}
 
 	os_close_file(vu_dev->sock);
+	kfree(vu_dev);
 }
 
 /* Platform device */
@@ -1096,7 +1097,7 @@ static int virtio_uml_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -EINVAL;
 
-	vu_dev = devm_kzalloc(&pdev->dev, sizeof(*vu_dev), GFP_KERNEL);
+	vu_dev = kzalloc(sizeof(*vu_dev), GFP_KERNEL);
 	if (!vu_dev)
 		return -ENOMEM;
 
-- 
2.27.0