ipc,sem: fix semctl(..., GETNCNT)

[firefly-linux-kernel-4.4.55.git] / ipc / sem.c

diff --git a/ipc/sem.c b/ipc/sem.c
index 04b264dbf141dd951230241ed933d5cd2553f69f..a7e40ed8a07674fd0493c1495a012a09759d835b 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -796,6 +796,13 @@ static int count_semncnt (struct sem_array * sma, ushort semnum)
        struct sem_queue * q;
 
        semncnt = 0;
+       list_for_each_entry(q, &sma->sem_base[semnum].sem_pending, list) {
+               struct sembuf * sops = q->sops;
+               BUG_ON(sops->sem_num != semnum);
+               if ((sops->sem_op < 0) && !(sops->sem_flg & IPC_NOWAIT))
+                       semncnt++;
+       }
+
        list_for_each_entry(q, &sma->sem_pending, list) {
                struct sembuf * sops = q->sops;
                int nsops = q->nsops;