iio: core: Fix entry not deleted when iio_register_sw_trigger_type() fails

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>

diff --git a/drivers/iio/industrialio-sw-trigger.c b/drivers/iio/industrialio-sw-trigger.c
index 994f03a715204f5bda01e81a318f93f368407612..d86a3305d9e8d7bdfcedf2488fbf328427507ca2 100644 (file)
--- a/drivers/iio/industrialio-sw-trigger.c
+++ b/drivers/iio/industrialio-sw-trigger.c
@@ -58,8 +58,12 @@ 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;
 }