diff options
| author | Li Zefan <lizefan@huawei.com> | 2014-02-27 18:19:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-23 21:44:09 -0700 |
| commit | 9a59929c894645615835deb478f99de178530b22 (patch) | |
| tree | f73be228e0642aa553e7d27df77b82fec5e2a4be /kernel | |
| parent | 54dbb836be1d8d9a398b8d6ef9184276179ae3cc (diff) | |
cpuset: fix a race condition in __cpuset_node_allowed_softwall()
commit 99afb0fd5f05aac467ffa85c36778fec4396209b upstream.
It's not safe to access task's cpuset after releasing task_lock().
Holding callback_mutex won't help.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpuset.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index bd1dfa2c7d89..5ae9f950e024 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2507,9 +2507,9 @@ int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) task_lock(current); cs = nearest_hardwall_ancestor(task_cs(current)); + allowed = node_isset(node, cs->mems_allowed); task_unlock(current); - allowed = node_isset(node, cs->mems_allowed); mutex_unlock(&callback_mutex); return allowed; } |