HID: hidraw: Add spinlock in struct hidraw to protect list
authorYonghua Zheng <younghua.zheng@gmail.com>
Mon, 26 Aug 2013 15:38:35 +0000 (23:38 +0800)
committerJiri Kosina <jkosina@suse.cz>
Mon, 26 Aug 2013 19:40:24 +0000 (21:40 +0200)
commit277fe44dd862412ee034470ad1c13a79d24e533b
tree7333fed46331fc756cfde7dfd58a1127de97955b
parent06bb5219118fb098f4b0c7dcb484b28a52bf1c14
HID: hidraw: Add spinlock in struct hidraw to protect list

It is unsafe to call list_for_each_entry in hidraw_report_event to
traverse each hidraw_list node without a lock protection, the list
could be modified if someone calls hidraw_release and list_del to
remove itself from the list, this can cause hidraw_report_event
to touch a deleted list struct and panic.

To prevent this, introduce a spinlock in struct hidraw to protect
list from concurrent access.

Signed-off-by: Yonghua Zheng <younghua.zheng@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/hidraw.c
include/linux/hidraw.h