From: Zefan Li <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: [PATCH] cgroup: fix unbalanced locking
Date: Thu, 18 Sep 2014 17:28:46 +0800 [thread overview]
Message-ID: <541AA5CE.8040006@huawei.com> (raw)
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: 4bac00d16a8760eae7205e41d2c246477d42a210
Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> # 3.14+
Signed-off-by: Zefan Li <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
kernel/cgroup.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2332efd..de70b63 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3970,7 +3970,6 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
l = cgroup_pidlist_find_create(cgrp, type);
if (!l) {
- mutex_unlock(&cgrp->pidlist_mutex);
pidlist_free(array);
return -ENOMEM;
}
--
1.8.0.2
WARNING: multiple messages have this Message-ID (diff)
From: Zefan Li <lizefan@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: Cgroups <cgroups@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] cgroup: fix unbalanced locking
Date: Thu, 18 Sep 2014 17:28:46 +0800 [thread overview]
Message-ID: <541AA5CE.8040006@huawei.com> (raw)
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: 4bac00d16a8760eae7205e41d2c246477d42a210
Cc: <stable@vger.kernel.org> # 3.14+
Signed-off-by: Zefan Li <lizefan@huawei.com>
---
kernel/cgroup.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2332efd..de70b63 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3970,7 +3970,6 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
l = cgroup_pidlist_find_create(cgrp, type);
if (!l) {
- mutex_unlock(&cgrp->pidlist_mutex);
pidlist_free(array);
return -ENOMEM;
}
--
1.8.0.2
next reply other threads:[~2014-09-18 9:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-18 9:28 Zefan Li [this message]
2014-09-18 9:28 ` [PATCH] cgroup: fix unbalanced locking Zefan Li
[not found] ` <541AA5CE.8040006-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2014-09-18 16:14 ` Cong Wang
2014-09-18 16:14 ` Cong Wang
2014-09-18 16:34 ` Tejun Heo
2014-09-18 16:34 ` Tejun Heo
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