From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Fri, 8 Feb 2008 12:19:07 +0000 (-0800)
Subject: wait_task_continued/zombie: don't use task_pid_nr_ns() lockless
X-Git-Tag: v2.6.25-rc1~223
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a515e4a62dbf7e4c213740268a5267faa69e5b2;p=pandora-kernel.git

wait_task_continued/zombie: don't use task_pid_nr_ns() lockless

Surprise, the other two wait_task_*() functions also abuse the
task_pid_nr_ns() function, and may cause read-after-free or report nr == 0
in wait_task_continued().  wait_task_zombie() doesn't have this problem,
but it is still better to cache pid_t rather than call task_pid_nr_ns()
three times on the saved pid_namespace.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
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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