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-rw-r--r--src/ipc/semctl.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/src/ipc/semctl.c b/src/ipc/semctl.c
index 3d79f503..673a9a8c 100644
--- a/src/ipc/semctl.c
+++ b/src/ipc/semctl.c
@@ -11,11 +11,15 @@ union semun {
 
 int semctl(int id, int num, int cmd, ...)
 {
-	union semun arg;
+	union semun arg = {0};
 	va_list ap;
-	va_start(ap, cmd);
-	arg = va_arg(ap, union semun);
-	va_end(ap);
+	switch (cmd) {
+	case SETVAL: case GETALL: case SETALL: case IPC_STAT: case IPC_SET:
+	case IPC_INFO: case SEM_INFO: case SEM_STAT:
+		va_start(ap, cmd);
+		arg = va_arg(ap, union semun);
+		va_end(ap);
+	}
 #ifdef SYS_semctl
 	return syscall(SYS_semctl, id, num, cmd | IPC_64, arg.buf);
 #else