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Message-ID: <lsq.1396221815.126353580@decadent.org.uk> Date: Mon, 31 Mar 2014 00:23:35 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Li Zefan" <lizefan@...wei.com>, "Tejun Heo" <tj@...nel.org> Subject: [PATCH 3.2 152/200] cpuset: fix a race condition in __cpuset_node_allowed_softwall() 3.2.56-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Li Zefan <lizefan@...wei.com> 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@...wei.com> Signed-off-by: Tejun Heo <tj@...nel.org> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- kernel/cpuset.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2366,9 +2366,9 @@ int __cpuset_node_allowed_softwall(int n 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; } -- 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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