From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 10 Dec 2014 23:55:25 +0000 (-0800)
Subject: exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=12279351a42d51638a21ede8a3f6c62aea26491e;p=linux-edison.git

exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting

commit 24c037ebf5723d4d9ab0996433cee4f96c292a4d upstream.

alloc_pid() does get_pid_ns() beforehand but forgets to put_pid_ns() if it
fails because disable_pid_allocation() was called by the exiting
child_reaper.

We could simply move get_pid_ns() down to successful return, but this fix
tries to be as trivial as possible.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Sterling Alexander <stalexan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/pid.c b/kernel/pid.c
index 0eb6d8e8b1d..3cdba517360 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -335,6 +335,8 @@ out:
 
 out_unlock:
 	spin_unlock_irq(&pidmap_lock);
+	put_pid_ns(ns);
+
 out_free:
 	while (++i <= ns->level)
 		free_pidmap(pid->numbers + i);