From 6fb533c458fadf896b590724cb6f8f4e2345af76 Mon Sep 17 00:00:00 2001
From: Robert O'Callahan <robert@ocallahan.org>
Date: Fri, 8 Mar 2024 08:58:21 +1300
Subject: [PATCH] Avoid passing an null pointer to `memcpy`

---
 src/TraceStream.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/TraceStream.cc b/src/TraceStream.cc
index 9beb06746c9..178ed91bcf6 100644
--- a/src/TraceStream.cc
+++ b/src/TraceStream.cc
@@ -669,8 +669,10 @@ TraceFrame TraceReader::read_frame(FrameTime skip_before) {
       auto mprotect_records = event.getSyscallbufFlush().getMprotectRecords();
       auto& records = ret.ev.SyscallbufFlush().mprotect_records;
       records.resize(mprotect_records.size() / sizeof(mprotect_record));
-      memcpy(records.data(), mprotect_records.begin(),
-             records.size() * sizeof(mprotect_record));
+      if (records.data()) {
+        memcpy(records.data(), mprotect_records.begin(),
+               records.size() * sizeof(mprotect_record));
+      }
       break;
     }
     case trace::Frame::Event::SYSCALL: {