mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-21 16:29:59 +00:00
Code Issues Releases Wiki Activity

iio: core: fix ioctl handlers removal

Browse source 
Currently ioctl handlers are removed twice. For the first time during
iio_device_unregister() then later on inside
iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask().
Double free leads to kernel panic.

Fix this by not touching ioctl handlers list directly but rather
letting code responsible for registration call the matching cleanup
routine itself.

Fixes: 8dedcc3eee ("iio: core: centralize ioctl() calls to the main chardev")
Signed-off-by: Tomasz Duszynski <tomasz.duszynski@octakon.com>
Acked-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210423080244.2790-1-tomasz.duszynski@octakon.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Tomasz Duszynski 2021-04-23 10:02:44 +02:00 committed by Jonathan Cameron
parent f73c730774
commit 901f84de0e
1 changed files with 0 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/iio/industrialio-core.c
View file

@ -1926,9 +1926,6 @@ EXPORT_SYMBOL(__iio_device_register);
**/
void iio_device_unregister(struct iio_dev *indio_dev)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
struct iio_ioctl_handler *h, *t;
cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
mutex_lock(&indio_dev->info_exist_lock);
@ -1939,9 +1936,6 @@ void iio_device_unregister(struct iio_dev *indio_dev)
indio_dev->info = NULL;
list_for_each_entry_safe(h, t, &iio_dev_opaque->ioctl_handlers, entry)
list_del(&h->entry);
iio_device_wakeup_eventset(indio_dev);
iio_buffer_wakeup_poll(indio_dev);