1 files changed, 11 insertions, 2 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index 8b929e6..c8e00f8 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1450,15 +1450,24 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
 	}
 
 	sma = sem_lock(ns, semid);
+
+	/*
+	 * Wait until it's guaranteed that no wakeup_sem_queue_do() is ongoing.
+	 */
+	error = get_queue_result(&queue);
+
+	/*
+	 * Array removed? If yes, leave without sem_unlock().
+	 */
 	if (IS_ERR(sma)) {
 		error = -EIDRM;
 		goto out_free;
 	}
 
-	error = get_queue_result(&queue);
 
 	/*
-	 * If queue.status != -EINTR we are woken up by another process
+	 * If queue.status != -EINTR we are woken up by another process.
+	 * Leave without unlink_queue(), but with sem_unlock().
 	 */
 
 	if (error != -EINTR) {