4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit f019f07ecf6a6b8bd6d7853bce70925d90af02d1 ]
The uio_unregister_device() function assumes that if "info->uio_dev" is non-NULL that means "info" is fully allocated. Setting info->uio_de has to be the last thing in the function.
In the current code, if request_threaded_irq() fails then we return with info->uio_dev set to non-NULL but info is not fully allocated and it can lead to double frees.
Fixes: beafc54c4e2f ("UIO: Add the User IO core code") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/uio/uio.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -833,8 +833,6 @@ int __uio_register_device(struct module if (ret) goto err_uio_dev_add_attributes;
- info->uio_dev = idev; - if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { /* * Note that we deliberately don't use devm_request_irq @@ -850,6 +848,7 @@ int __uio_register_device(struct module goto err_request_irq; }
+ info->uio_dev = idev; return 0;
err_request_irq: