1 files changed, 10 insertions, 0 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index 87bd38f38dc3..a4af04979fd2 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1213,10 +1213,20 @@ static int semctl_stat(struct ipc_namespace *ns, int semid,
         if (err)
                 goto out_unlock;
 
+        ipc_lock_object(&sma->sem_perm);
+
+        if (!ipc_valid_object(&sma->sem_perm)) {
+                ipc_unlock_object(&sma->sem_perm);
+                err = -EIDRM;
+                goto out_unlock;
+        }
+
         kernel_to_ipc64_perm(&sma->sem_perm, &semid64->sem_perm);
         semid64->sem_otime = get_semotime(sma);
         semid64->sem_ctime = sma->sem_ctime;
         semid64->sem_nsems = sma->sem_nsems;
+
+        ipc_unlock_object(&sma->sem_perm);
         rcu_read_unlock();
         return id;