From 4ad09d956f8eacff61e67e5b13ba8ebec3232f76 Mon Sep 17 00:00:00 2001
From: Chen Zhongjin <chenzhongjin@huawei.com>
Date: Tue, 8 Nov 2022 11:28:02 +0800
Subject: [PATCH] iio: core: Fix entry not deleted when iio_register_sw_trigger_type() fails
Git-commit: 4ad09d956f8eacff61e67e5b13ba8ebec3232f76
Patch-mainline: v6.1-rc7
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iio/industrialio-sw-trigger.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/industrialio-sw-trigger.c b/drivers/iio/industrialio-sw-trigger.c
index 994f03a71520..d86a3305d9e8 100644
--- 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;
}
--
2.35.3