Commit e8c35a76 authored by Zefan Li's avatar Zefan Li Committed by Greg Kroah-Hartman

cgroup: fix unbalanced locking

commit eb4aec84 upstream.

cgroup_pidlist_start() holds cgrp->pidlist_mutex and then calls
pidlist_array_load(), and cgroup_pidlist_stop() releases the mutex.

It is wrong that we release the mutex in the failure path in
pidlist_array_load(), because cgroup_pidlist_stop() will be called
no matter if cgroup_pidlist_start() returns errno or not.

Fixes: 4bac00d1Signed-off-by: default avatarZefan Li <lizefan@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7d73a89b
...@@ -3833,7 +3833,6 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type, ...@@ -3833,7 +3833,6 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
l = cgroup_pidlist_find_create(cgrp, type); l = cgroup_pidlist_find_create(cgrp, type);
if (!l) { if (!l) {
mutex_unlock(&cgrp->pidlist_mutex);
pidlist_free(array); pidlist_free(array);
return -ENOMEM; return -ENOMEM;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment