sys_getppid: add missing rcu_dereference

031af165 · Mandeep Singh Baines <[email protected]> · 2011-12-08 14:34:44 -08:00

In order to safely dereference current->real_parent inside an
rcu_read_lock, we need an rcu_dereference.

Signed-off-by: Mandeep Singh Baines <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 031af165b1cd295ef04d2bfbcae9bc3cb9180735
Parents: 1cee22b7

Changes

1 files changed · +1 −1

File	Status	Add	Del	Content
kernel/timer.c	modified	+1	−1	View file

kernel/timer.c

View file

diff --git a/kernel/timer.c b/kernel/timer.c
index dbaa624..9c3c62b 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1368,7 +1368,7 @@ SYSCALL_DEFINE0(getppid)
 	int pid;
 
 	rcu_read_lock();
-	pid = task_tgid_vnr(current->real_parent);
+	pid = task_tgid_vnr(rcu_dereference(current->real_parent));
 	rcu_read_unlock();
 
 	return pid;