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authorOleg Nesterov <oleg@redhat.com>2014-12-10 15:55:25 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-08 09:58:17 -0800
commit12279351a42d51638a21ede8a3f6c62aea26491e (patch)
treee4fa6e2153fa9c07e10bf7eb9af268a5d9db40e3
parentcb22aba0ee2bc330033b85447b4d44b1501ee75f (diff)
downloadlinux-rt-12279351a42d51638a21ede8a3f6c62aea26491e.tar.gz
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>
-rw-r--r--kernel/pid.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/pid.c b/kernel/pid.c
index 0eb6d8e8b1da..3cdba5173600 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);