[PATCH v2 1/2] exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting

[Oleg Nesterov]

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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
 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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