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Message-ID: <1546952508-186003-3-git-send-email-liujian56@huawei.com>
Date: Tue, 8 Jan 2019 21:01:48 +0800
From: Liu Jian <liujian56@...wei.com>
To: <gregkh@...uxfoundation.org>, <hamish.martin@...iedtelesis.co.nz>
CC: <liujian56@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] driver: uio: fix possible use-after-free in __uio_register_device
From: liujian <liujian56@...wei.com>
In uio_dev_add_attributes() error handing case, idev is used after
device_unregister(), in which 'idev' has been released, touch idev cause
use-after-free.
Fixes: a93e7b331568 ("uio: Prevent device destruction while fds are
open")
Signed-off-by: Liu Jian <liujian56@...wei.com>
Reviewed-by: Hamish Martin <hamish.martin@...iedtelesis.co.nz>
---
drivers/uio/uio.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 7280552..be2a943 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -945,6 +945,7 @@ int __uio_register_device(struct module *owner,
return ret;
}
+ device_initialize(&idev->dev);
idev->dev.devt = MKDEV(uio_major, idev->minor);
idev->dev.class = &uio_class;
idev->dev.parent = parent;
@@ -955,7 +956,7 @@ int __uio_register_device(struct module *owner,
if (ret)
goto err_device_create;
- ret = device_register(&idev->dev);
+ ret = device_add(&idev->dev);
if (ret)
goto err_device_create;
@@ -987,9 +988,10 @@ int __uio_register_device(struct module *owner,
err_request_irq:
uio_dev_del_attributes(idev);
err_uio_dev_add_attributes:
- device_unregister(&idev->dev);
+ device_del(&idev->dev);
err_device_create:
uio_free_minor(idev);
+ put_device(&idev->dev);
return ret;
}
EXPORT_SYMBOL_GPL(__uio_register_device);
--
2.7.4
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