Bugfix: don't inherit od_table across forks

The od_table is strictly per-thread and should not be inherited across
a fork/clone. This caused memory corruption when a task exited, which
ultimately could lead to oopses in unrelated code.

Bug and testcase initially reported by Glenn.

1 files changed, 3 insertions, 0 deletions

diff --git a/litmus/litmus.c b/litmus/litmus.c
index 589062f8ab87..3cf7cb9e8a9f 100644
--- a/litmus/litmus.c
+++ b/litmus/litmus.c
@@ -418,6 +418,9 @@ void litmus_fork(struct task_struct* p)
         else
                 /* non-rt tasks might have ctrl_page set */
                 tsk_rt(p)->ctrl_page = NULL;
+
+        /* od tables are never inherited across a fork */
+        p->od_table = NULL;
 }
 
 /* Called upon execve().