exit signals: use of uninitialized field notify_count

task->signal->notify_count is only initialized if
task->signal->group_exit_task is not NULL.  Reorder a conditional so
that uninitialised memory is not used.  Found by Valgrind.

Signed-off-by: Steve VanDeBogart <vandebo-lkml@nerdbox.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/exit.c b/kernel/exit.c
index 38ec40630149bd07b97f06d406d9398763a6de8c..75c6473876394f7a1956908fe0bb423f5e5536f7 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -918,8 +918,8 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 
        /* mt-exec, de_thread() is waiting for us */
        if (thread_group_leader(tsk) &&
-           tsk->signal->notify_count < 0 &&
-           tsk->signal->group_exit_task)
+           tsk->signal->group_exit_task &&
+           tsk->signal->notify_count < 0)
                wake_up_process(tsk->signal->group_exit_task);
 
        write_unlock_irq(&tasklist_lock);