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| author | Chen Zhongjin <chenzhongjin@huawei.com> | 2022-11-08 11:28:02 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-08 11:18:30 +0100 |
| commit | 9424b6719a00f46ef6e749a0788467ce07883105 (patch) | |
| tree | f7acd7c4aed2eb66de561ccafa683362c4bf7b68 /drivers | |
| parent | 514f08941d2aa238b087836828b26a04dbaae2bc (diff) | |
| download | linux-9424b6719a00f46ef6e749a0788467ce07883105.tar.gz linux-9424b6719a00f46ef6e749a0788467ce07883105.tar.bz2 linux-9424b6719a00f46ef6e749a0788467ce07883105.zip | |
iio: core: Fix entry not deleted when iio_register_sw_trigger_type() fails
commit 4ad09d956f8eacff61e67e5b13ba8ebec3232f76 upstream.
In iio_register_sw_trigger_type(), configfs_register_default_group() is
possible to fail, but the entry add to iio_trigger_types_list is not
deleted.
This leaves wild in iio_trigger_types_list, which can cause page fault
when module is loading again. So fix this by list_del(&t->list) in error
path.
BUG: unable to handle page fault for address: fffffbfff81d7400
Call Trace:
<TASK>
iio_register_sw_trigger_type
do_one_initcall
do_init_module
load_module
...
Fixes: b662f809d410 ("iio: core: Introduce IIO software triggers")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Link: https://lore.kernel.org/r/20221108032802.168623-1-chenzhongjin@huawei.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iio/industrialio-sw-trigger.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-sw-trigger.c b/drivers/iio/industrialio-sw-trigger.c index bc6b7fb43e3a..b4b177c16865 100644 --- a/drivers/iio/industrialio-sw-trigger.c +++ b/drivers/iio/industrialio-sw-trigger.c @@ -61,8 +61,12 @@ int iio_register_sw_trigger_type(struct iio_sw_trigger_type *t) t->group = configfs_register_default_group(iio_triggers_group, t->name, &iio_trigger_type_group_type); - if (IS_ERR(t->group)) + if (IS_ERR(t->group)) { + mutex_lock(&iio_trigger_types_lock); + list_del(&t->list); + mutex_unlock(&iio_trigger_types_lock); ret = PTR_ERR(t->group); + } return ret; } |