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pids: __set_special_pids: use change_pid() helper
Use change_pid() instead of detach_pid() + attach_pid() in __set_special_pids(). This way task_session() is not NULL in between. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -334,13 +334,11 @@ void __set_special_pids(struct pid *pid)
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pid_t nr = pid_nr(pid);
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if (task_session(curr) != pid) {
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detach_pid(curr, PIDTYPE_SID);
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attach_pid(curr, PIDTYPE_SID, pid);
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change_pid(curr, PIDTYPE_SID, pid);
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set_task_session(curr, nr);
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}
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if (task_pgrp(curr) != pid) {
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detach_pid(curr, PIDTYPE_PGID);
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attach_pid(curr, PIDTYPE_PGID, pid);
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change_pid(curr, PIDTYPE_PGID, pid);
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set_task_pgrp(curr, nr);
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}
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}
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