From 24cab5eedba19cbec3419e52d426263f544a8cbe Mon Sep 17 00:00:00 2001
From: hanzhijian <hanzhijian@zepp.com>
Date: Thu, 20 Aug 2026 19:29:49 +0800
Subject: [PATCH] [bsp][nuvoton] Clamp CAN receive DLC

---
 bsp/nuvoton/libraries/m2354/rtt_port/drv_can.c  | 4 ++++
 bsp/nuvoton/libraries/m480/rtt_port/drv_can.c   | 4 ++++
 bsp/nuvoton/libraries/n9h30/rtt_port/drv_can.c  | 4 ++++
 bsp/nuvoton/libraries/nuc980/rtt_port/drv_can.c | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/bsp/nuvoton/libraries/m2354/rtt_port/drv_can.c b/bsp/nuvoton/libraries/m2354/rtt_port/drv_can.c
index 89236c329d35..4be31bb3b6b9 100644
--- a/bsp/nuvoton/libraries/m2354/rtt_port/drv_can.c
+++ b/bsp/nuvoton/libraries/m2354/rtt_port/drv_can.c
@@ -515,6 +515,10 @@ static int nu_can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t boxn
     pmsg->rtr = (tMsg.FrameType == CAN_DATA_FRAME) ? RT_CAN_DTR : RT_CAN_RTR;
     pmsg->id  = tMsg.Id;
     pmsg->len = tMsg.DLC ;
+    if (pmsg->len > sizeof(tMsg.Data))
+    {
+        pmsg->len = sizeof(tMsg.Data);
+    }
 
     if (pmsg->data && pmsg->len)
         rt_memcpy(pmsg->data, &tMsg.Data[0], pmsg->len);
diff --git a/bsp/nuvoton/libraries/m480/rtt_port/drv_can.c b/bsp/nuvoton/libraries/m480/rtt_port/drv_can.c
index c35c4eb7012e..f72aab445af8 100644
--- a/bsp/nuvoton/libraries/m480/rtt_port/drv_can.c
+++ b/bsp/nuvoton/libraries/m480/rtt_port/drv_can.c
@@ -566,6 +566,10 @@ static int nu_can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t boxn
     pmsg->rtr = (tMsg.FrameType == CAN_DATA_FRAME) ? RT_CAN_DTR : RT_CAN_RTR;
     pmsg->id  = tMsg.Id;
     pmsg->len = tMsg.DLC ;
+    if (pmsg->len > sizeof(tMsg.Data))
+    {
+        pmsg->len = sizeof(tMsg.Data);
+    }
 
     if (pmsg->data && pmsg->len)
         rt_memcpy(pmsg->data, &tMsg.Data[0], pmsg->len);
diff --git a/bsp/nuvoton/libraries/n9h30/rtt_port/drv_can.c b/bsp/nuvoton/libraries/n9h30/rtt_port/drv_can.c
index 77281e482b85..a2aa38e95bc5 100644
--- a/bsp/nuvoton/libraries/n9h30/rtt_port/drv_can.c
+++ b/bsp/nuvoton/libraries/n9h30/rtt_port/drv_can.c
@@ -515,6 +515,10 @@ static int nu_can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t boxn
     pmsg->rtr = (tMsg.FrameType == CAN_DATA_FRAME) ? RT_CAN_DTR : RT_CAN_RTR;
     pmsg->id  = tMsg.Id;
     pmsg->len = tMsg.DLC ;
+    if (pmsg->len > sizeof(tMsg.Data))
+    {
+        pmsg->len = sizeof(tMsg.Data);
+    }
 
     if (pmsg->data && pmsg->len)
         rt_memcpy(pmsg->data, &tMsg.Data[0], pmsg->len);
diff --git a/bsp/nuvoton/libraries/nuc980/rtt_port/drv_can.c b/bsp/nuvoton/libraries/nuc980/rtt_port/drv_can.c
index 159e3df348c7..e9959eb42430 100644
--- a/bsp/nuvoton/libraries/nuc980/rtt_port/drv_can.c
+++ b/bsp/nuvoton/libraries/nuc980/rtt_port/drv_can.c
@@ -539,6 +539,10 @@ static int nu_can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t boxn
     pmsg->rtr = (tMsg.FrameType == CAN_DATA_FRAME) ? RT_CAN_DTR : RT_CAN_RTR;
     pmsg->id  = tMsg.Id;
     pmsg->len = tMsg.DLC ;
+    if (pmsg->len > sizeof(tMsg.Data))
+    {
+        pmsg->len = sizeof(tMsg.Data);
+    }
 
     if (pmsg->data && pmsg->len)
         rt_memcpy(pmsg->data, &tMsg.Data[0], pmsg->len);