X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=security%2Fkeys%2Fkeyctl.c;h=3868c6700b588512acc36814682f895644116089;hb=9d1ac65a9698513d00e5608d93fca0c53f536c14;hp=b2b0998d6abda7759433d7032d255eb0a317c126;hpb=ff3cb3fec3c5bbb5110e652bbdd410bc99a47e9f;p=net-next-2.6.git

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index b2b0998d6ab..3868c6700b5 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1272,6 +1272,7 @@ long keyctl_session_to_parent(void)
 	keyring_r = NULL;
 
 	me = current;
+	rcu_read_lock();
 	write_lock_irq(&tasklist_lock);
 
 	parent = me->real_parent;
@@ -1319,6 +1320,7 @@ long keyctl_session_to_parent(void)
 	set_ti_thread_flag(task_thread_info(parent), TIF_NOTIFY_RESUME);
 
 	write_unlock_irq(&tasklist_lock);
+	rcu_read_unlock();
 	if (oldcred)
 		put_cred(oldcred);
 	return 0;
@@ -1327,6 +1329,7 @@ already_same:
 	ret = 0;
 not_permitted:
 	write_unlock_irq(&tasklist_lock);
+	rcu_read_unlock();
 	put_cred(cred);
 	return ret;