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| author | Li Zefan <lizefan@huawei.com> | 2014-02-27 18:19:36 +0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-22 22:01:55 +0100 |
| commit | 44ba741a0f470c22c691586dea1e219df757fef2 (patch) | |
| tree | bd3805a76a0985882af6c0d045c7d23894ba0877 | |
| parent | d1275b0297b1995a15aab2361f4051684c18a2ea (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: Jiri Slaby <jslaby@suse.cz>
| -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 bd1dfa2c7d8..5ae9f950e02 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; } |