diff options
| author | Liu Jian <liujian56@huawei.com> | 2019-01-23 06:45:38 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 14:46:15 +0100 |
| commit | 548752cabfaaf3945f2da9d202e70015c2991e9a (patch) | |
| tree | 53bc8ac2d1aba1c8ec7f0ac2f3a0aa99c03f7cf1 /drivers/uio | |
| parent | 1b97b03ace9e5f2d84dba9e8e347e76cfda40dbf (diff) | |
driver: uio: fix possible use-after-free in __uio_register_device
[ Upstream commit 221a1f4ac12d2ab46246c160b2e00d1b1160d5d9 ]
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@huawei.com>
Reviewed-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/uio.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 4e9b0ff79b13..7c18536a3742 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -944,6 +944,7 @@ 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; @@ -954,7 +955,7 @@ 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; @@ -986,9 +987,10 @@ 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); |