diff --git a/devicemodel/core/main.c b/devicemodel/core/main.c
index ec7d099e9..6e237f561 100644
--- a/devicemodel/core/main.c
+++ b/devicemodel/core/main.c
@@ -924,6 +924,10 @@ dm_run(int argc, char *argv[])
 	}
 
 	vmname = argv[0];
+	if (strnlen(vmname, MAX_VM_OS_NAME_LEN) >= MAX_VM_OS_NAME_LEN) {
+		fprintf(stderr, "vmname size exceed %u\n",MAX_VM_OS_NAME_LEN);
+		exit(1);
+	}
 
 	for (;;) {
 		ctx = vm_create(vmname, (unsigned long)vhm_req_buf);
diff --git a/devicemodel/hw/platform/ioc.c b/devicemodel/hw/platform/ioc.c
index 72aa17247..4f2e746f1 100644
--- a/devicemodel/hw/platform/ioc.c
+++ b/devicemodel/hw/platform/ioc.c
@@ -100,7 +100,7 @@ typedef void* (*ioc_work)(void *arg);
  * IOC mediator and virtual UART communication channel path,
  * comes from DM command line parameters.
  */
-static char virtual_uart_path[32];
+static char virtual_uart_path[32 + MAX_VM_OS_NAME_LEN];
 
 /*
  * To activate CBC signal channel(/dev/cbc-signals).