diff options
| -rw-r--r-- | ipc/sem.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index bd907ed2ce00..31cfe0f5fa8d 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -2171,6 +2171,7 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops, * scenarios where we were awakened externally, during the * window between wake_q_add() and wake_up_q(). */ + rcu_read_lock(); error = READ_ONCE(queue.status); if (error != -EINTR) { /* @@ -2180,10 +2181,10 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops, * overwritten by the previous owner of the semaphore. */ smp_mb(); + rcu_read_unlock(); goto out_free; } - rcu_read_lock(); locknum = sem_lock(sma, sops, nsops); if (!ipc_valid_object(&sma->sem_perm)) |