1 files changed, 1 insertions, 0 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index d56d3ab6bb8a..e9418df5ff3e 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1250,6 +1250,7 @@ void exit_sem(struct task_struct *tsk)
         undo_list = tsk->sysvsem.undo_list;
         if (!undo_list)
                 return;
+        tsk->sysvsem.undo_list = NULL;
 
         if (!atomic_dec_and_test(&undo_list->refcnt))
                 return;