From 6f995547fe5e346ce477268394605a27348b7e24 Mon Sep 17 00:00:00 2001
From: jxltom <jxltom@gmail.com>
Date: Thu, 12 Mar 2020 14:24:31 +0800
Subject: [PATCH] Avoid overflow when can frame dlc is not set correctly

---
 mcp2515.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mcp2515.cpp b/mcp2515.cpp
index 833a133..88c91b2 100644
--- a/mcp2515.cpp
+++ b/mcp2515.cpp
@@ -573,6 +573,10 @@ MCP2515::ERROR MCP2515::setFilter(const RXF num, const bool ext, const uint32_t
 
 MCP2515::ERROR MCP2515::sendMessage(const TXBn txbn, const struct can_frame *frame)
 {
+    if (frame->can_dlc > CAN_MAX_DLEN) {
+        return ERROR_FAILTX;
+    }
+
     const struct TXBn_REGS *txbuf = &TXB[txbn];
 
     uint8_t data[13];