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Message-ID: <530F1138.2090903@huawei.com> Date: Thu, 27 Feb 2014 18:19:36 +0800 From: Li Zefan <lizefan@...wei.com> To: Tejun Heo <tj@...nel.org> CC: LKML <linux-kernel@...r.kernel.org>, Cgroups <cgroups@...r.kernel.org> Subject: [PATCH 2/2] cpuset: fix a race condition in __cpuset_node_allowed_softwall() It's not safe to access task's cpuset after releasing task_lock(). Holding callback_mutex won't help. Cc: <stable@...r.kernel.org> Signed-off-by: Li Zefan <lizefan@...wei.com> --- kernel/cpuset.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 5f50ec6..c63a0d9 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2412,9 +2412,9 @@ 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; } -- 1.8.0.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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