diff --git a/kernel/fork.c b/kernel/fork.c
index 1b27babc4c78..9cf8add7038d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1417,7 +1417,9 @@ static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk)
 		return -ENOMEM;
 
 	atomic_set(&sig->count, 1);
+	spin_lock_irq(&current->sighand->siglock);
 	memcpy(sig->action, current->sighand->action, sizeof(sig->action));
+	spin_unlock_irq(&current->sighand->siglock);
 	return 0;
 }