linux-kernel - [PATCH v2 1/2] exit: pidns: alloc_pid() leaks pid_namespace if child

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Message-ID: <20141126235434.GA378@redhat.com>
Date:	Thu, 27 Nov 2014 00:54:34 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Aaron Tomlin <atomlin@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Sterling Alexander <stalexan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] exit: pidns: alloc_pid() leaks pid_namespace if
	child_reaper is exiting

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@...hat.com>
Cc: stable@...r.kernel.org
---
 kernel/pid.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 9b9a266..82430c8 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -341,6 +341,8 @@ out:
 
 out_unlock:
 	spin_unlock_irq(&pidmap_lock);
+	put_pid_ns(ns);
+
 out_free:
 	while (++i <= ns->level)
 		free_pidmap(pid->numbers + i);
-- 
1.5.5.1

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