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

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commit 4ad09d956f 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: b662f809d4 ("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>
This commit is contained in:
Chen Zhongjin 2022-11-08 11:28:02 +08:00 committed by Greg Kroah-Hartman
parent fa9efcbfbf
commit 456e895fd0
1 changed files with 5 additions and 1 deletions
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6
drivers/iio/industrialio-sw-trigger.c
View File

@ -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;
}