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 21:37:05 -0700 |
| commit | c5ad4fdec0ae15d197508185643c68470868121d (patch) | |
| tree | d665cfe6c40a7e0f950aefbba227fcd691e2416e | |
| parent | b46741f24d1c0d0d8dcfb3c63439338d2dc0337e (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>
| -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 e372d9495e42..4b843ace285c 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2338,9 +2338,9 @@ 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; } |