From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 30 Jun 2012 07:55:24 +0000 (+0400)
Subject: hold task_lock around checks in keyctl
X-Git-Tag: v3.6~263^2~90
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d35abdb28824cf74f0a106a0f9c6f3ff700a35bf;p=platform%2Fkernel%2Flinux-amlogic.git

hold task_lock around checks in keyctl

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 0291b3f..f1b59ae 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1486,6 +1486,7 @@ long keyctl_session_to_parent(void)
 	oldwork = NULL;
 	parent = me->real_parent;
 
+	task_lock(parent);
 	/* the parent mustn't be init and mustn't be a kernel thread */
 	if (parent->pid <= 1 || !parent->mm)
 		goto unlock;
@@ -1529,6 +1530,7 @@ long keyctl_session_to_parent(void)
 	if (!ret)
 		newwork = NULL;
 unlock:
+	task_unlock(parent);
 	write_unlock_irq(&tasklist_lock);
 	rcu_read_unlock();
 	if (oldwork)