From 221a1f4ac12d2ab46246c160b2e00d1b1160d5d9 Mon Sep 17 00:00:00 2001 From: Liu Jian Date: Wed, 23 Jan 2019 06:45:38 +0800 Subject: driver: uio: fix possible use-after-free in __uio_register_device 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 Reviewed-by: Hamish Martin Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index f23ef235359f..a57698985f9c 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); -- cgit v1.2.3