提交 d2308225 编写于 作者: O Oleg Nesterov 提交者: Linus Torvalds

pid_namespace: pidns_get() should check task_active_pid_ns() != NULL

pidns_get()->get_pid_ns() can hit ns == NULL. This task_struct can't
go away, but task_active_pid_ns(task) is NULL if release_task(task)
was already called. Alternatively we could change get_pid_ns(ns) to
check ns != NULL, but it seems that other callers are fine.
Signed-off-by: NOleg Nesterov <oleg@redhat.com>
Cc: Eric W. Biederman ebiederm@xmission.com>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 7cbb39d4
......@@ -318,7 +318,9 @@ static void *pidns_get(struct task_struct *task)
struct pid_namespace *ns;
rcu_read_lock();
ns = get_pid_ns(task_active_pid_ns(task));
ns = task_active_pid_ns(task);
if (ns)
get_pid_ns(ns);
rcu_read_unlock();
return ns;
......
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