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Message-Id: <1396368519-12728-32-git-send-email-kamal@canonical.com> Date: Tue, 1 Apr 2014 09:07:44 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Li Zefan <lizefan@...wei.com>, Tejun Heo <tj@...nel.org>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.8 31/86] cpuset: fix a race condition in __cpuset_node_allowed_softwall() 3.8.13.21 -stable 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: Kamal Mostafa <kamal@...onical.com> --- kernel/cpuset.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index aa4ec01..47e7595 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2370,9 +2370,9 @@ 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; } -- 1.8.3.2 -- 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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