From f027059629257841cb1329a9ca576fc7a05c5aa6 Mon Sep 17 00:00:00 2001
From: Dean Lee <deanlee3@gmail.com>
Date: Sat, 8 Jun 2024 07:48:37 +0800
Subject: [PATCH] CANParser: fix can data size issue (#799)

fix can data size issues

Co-authored-by: Shane Smiskol <shane@smiskol.com>
---
 can/parser.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/can/parser.cc b/can/parser.cc
index 3efa3ee369..39c0876720 100644
--- a/can/parser.cc
+++ b/can/parser.cc
@@ -236,8 +236,9 @@ void CANParser::UpdateCans(uint64_t nanos, const capnp::List<cereal::CanData>::R
     //  DEBUG("got message with unexpected length: expected %d, got %zu for %d", state_it->second.size, dat.size(), cmsg.getAddress());
     //  continue;
     //}
-
-    std::vector<uint8_t> data(dat.size(), 0);
+    // make sure the data_size if not less than state_it->second.size.
+    size_t data_size = std::max<size_t>(dat.size(), state_it->second.size);
+    std::vector<uint8_t> data(data_size, 0);
     memcpy(data.data(), dat.begin(), dat.size());
     state_it->second.parse(nanos, data);
   }