From: Yonghua Zheng <younghua.zheng@gmail.com>
Date: Tue, 30 Jul 2013 06:16:10 +0000 (+0800)
Subject: HID: hidraw: fix improper mutex release
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=8e552e535948fe8612d36a7beaf19519140bc285;p=openwrt%2Fstaging%2Fblogic.git

HID: hidraw: fix improper mutex release

Mutex can not be released unless all hid_device members are properly
initialized. Otherwise it would result in a race condition that can
cause NULL pointer kernel panic issue in hidraw_open where it uses
uninitialized 'list' member in list_add_tail().

Signed-off-by: Yonghua Zheng <younghua.zheng@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index a7451632ceb4..6f1feb2c2e97 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -518,7 +518,6 @@ int hidraw_connect(struct hid_device *hid)
 		goto out;
 	}
 
-	mutex_unlock(&minors_lock);
 	init_waitqueue_head(&dev->wait);
 	INIT_LIST_HEAD(&dev->list);
 
@@ -528,6 +527,7 @@ int hidraw_connect(struct hid_device *hid)
 	dev->exist = 1;
 	hid->hidraw = dev;
 
+	mutex_unlock(&minors_lock);
 out:
 	return result;