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-rw-r--r--ipc/sem.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index 2bf535dd0..cc6af85d1 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -2148,6 +2148,7 @@ 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) {
/*
@@ -2157,10 +2158,10 @@ 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))