EDF-WM: make sure a sliced task has its fields initialized

This created a juicy NULL dereference due to wm.slice being NULL.

1 files changed, 10 insertions, 0 deletions

diff --git a/litmus/sched_edf_wm.c b/litmus/sched_edf_wm.c
index 4266b1019f52..34f8421afdf5 100644
--- a/litmus/sched_edf_wm.c
+++ b/litmus/sched_edf_wm.c
@@ -395,6 +395,16 @@ static void wm_task_new(struct task_struct * t, int on_rq, int running)
          * code will try to wake it up with fatal consequences.
          */
         raw_spin_lock_irqsave(&dom->slock, flags);
+
+        if (is_sliced_task(t)) {
+                /* make sure parameters are initialized consistently */
+                tsk_rt(t)->semi_part.wm.exec_time = 0;
+                tsk_rt(t)->semi_part.wm.job_release  = get_release(t);
+                tsk_rt(t)->semi_part.wm.job_deadline = get_deadline(t);
+                tsk_rt(t)->semi_part.wm.slice = tsk_rt(t)->task_params.semi_part.wm.slices;
+                tsk_rt(t)->job_params.exec_time = 0;
+        }
+
         if (running) {
                 /* there shouldn't be anything else running at the time */
                 BUG_ON(dom->scheduled);