diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-08-02 11:24:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:47:13 +0200 |
| commit | 2b6c7457d3e080d2374d083838877a26911d4b1b (patch) | |
| tree | 2903ed74a27b1a2ac084ff1a63684ac7bc40fe58 | |
| parent | 4795df607a0eb863686e9262a50b55e9afecff14 (diff) | |
uio: potential double frees if __uio_register_device() fails
[ 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>
| -rw-r--r-- | drivers/uio/uio.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 208bc52fc84d..f0a9ea2740df 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -841,8 +841,6 @@ int __uio_register_device(struct module *owner, 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 @@ -858,6 +856,7 @@ int __uio_register_device(struct module *owner, goto err_request_irq; } + info->uio_dev = idev; return 0; err_request_irq: |