From b327e06ac5a83f15c63a71e9f947648513a9a60e Mon Sep 17 00:00:00 2001
From: Bastian Bloessl <mail@bastibl.net>
Date: Tue, 19 May 2026 14:26:15 +0200
Subject: [PATCH] crc32 warning

---
 lib/append_crc32_impl.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/append_crc32_impl.cc b/lib/append_crc32_impl.cc
index c9e5fe3..19e5716 100644
--- a/lib/append_crc32_impl.cc
+++ b/lib/append_crc32_impl.cc
@@ -24,6 +24,7 @@
 
 #include <cstdint>
 #include <cstring>
+#include <limits>
 #include <stdexcept>
 #include <vector>
 
@@ -75,6 +76,9 @@ void append_crc32_impl::handle(pmt::pmt_t msg)
     result.process_bytes(data, len);
     uint32_t crc = result.checksum();
 
+    if(len > std::numeric_limits<size_t>::max() - sizeof(uint32_t))
+        throw std::length_error("append_crc32 payload too large");
+
     std::vector<uint8_t> out(len + sizeof(uint32_t));
     std::memcpy(out.data(), data, len);
     std::memcpy(out.data() + len, &crc, sizeof(uint32_t));