X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=kernel%2Fsys.c;h=7f5a0cd296a96ca44e43f0db028026094dbbb57a;hb=HEAD;hp=e9ad4448982860af9919df53c3368156a4bf2445;hpb=b618f6f885579a6237e5bf4582fa6167972ddef4;p=net-next-2.6.git

diff --git a/kernel/sys.c b/kernel/sys.c
index e9ad4448982..7f5a0cd296a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -931,6 +931,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
 		pgid = pid;
 	if (pgid < 0)
 		return -EINVAL;
+	rcu_read_lock();
 
 	/* From this point forward we keep holding onto the tasklist lock
 	 * so that our parent does not change from under us. -DaveM
@@ -984,6 +985,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
 out:
 	/* All paths lead to here, thus we are safe. -DaveM */
 	write_unlock_irq(&tasklist_lock);
+	rcu_read_unlock();
 	return err;
 }