From b2faa4da5e697d943efa5b8126f736df6f913496 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 27 Feb 2014 18:19:36 +0800 Subject: 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 Signed-off-by: Tejun Heo Signed-off-by: Ben Hutchings --- kernel/cpuset.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 57eb98d1d887..1e2c5f025dcf 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2366,9 +2366,9 @@ 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; } -- cgit v1.2.3