1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 2a5e3830e953..2579e407ff67 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -900,7 +900,7 @@ static int attach_to_pi_owner(u32 uval, union futex_key *key,
         if (!p)
                 return -ESRCH;
 
-        if (!p->mm) {
+        if (unlikely(p->flags & PF_KTHREAD)) {
                 put_task_struct(p);
                 return -EPERM;
         }