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Message-Id: <20250804075944.3612712-1-linmq006@gmail.com>
Date: Mon, 4 Aug 2025 11:59:42 +0400
From: Miaoqian Lin <linmq006@...il.com>
To: Richard Weinberger <richard@....at>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Johannes Berg <johannes@...solutions.net>,
Benjamin Berg <benjamin.berg@...el.com>,
Tiwei Bie <tiwei.btw@...group.com>,
Miaoqian Lin <linmq006@...il.com>,
linux-um@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] um: virtio_uml: Fix use-after-free after put_device in probe
When register_virtio_device() fails in virtio_uml_probe(),
the code sets vu_dev->registered = 1 even though
the device was not successfully registered.
This can lead to use-after-free or other issues.
Fixes: 04e5b1fb0183 ("um: virtio: Remove device on disconnect")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
arch/um/drivers/virtio_uml.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index ad8d78fb1d9a..c402c4cc908a 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -1250,8 +1250,10 @@ static int virtio_uml_probe(struct platform_device *pdev)
device_set_wakeup_capable(&vu_dev->vdev.dev, true);
rc = register_virtio_device(&vu_dev->vdev);
- if (rc)
+ if (rc) {
put_device(&vu_dev->vdev.dev);
+ return rc;
+ }
vu_dev->registered = 1;
return rc;
--
2.25.1
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