1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 7c68225e3967..81dbe773ce4c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -814,6 +814,11 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
         if (!p)
                 return -ESRCH;
 
+        if (!p->mm) {
+                put_task_struct(p);
+                return -EPERM;
+        }
+
         /*
          * We need to look at the task state flags to figure out,
          * whether the task is exiting. To protect against the do_exit