From 051ae7c282b5487a0dfb5214b9855cd45066c813 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Mon, 16 May 2022 11:07:26 -0400
Subject: [PATCH] Improve handling of replacing stream data with empty strings

---
 libqpdf/QPDFObjectHandle.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libqpdf/QPDFObjectHandle.cc b/libqpdf/QPDFObjectHandle.cc
index 10fb153..4a61f59 100644
--- a/libqpdf/QPDFObjectHandle.cc
+++ b/libqpdf/QPDFObjectHandle.cc
@@ -1468,7 +1468,9 @@ QPDFObjectHandle::replaceStreamData(
     assertStream();
     auto b = std::make_shared<Buffer>(data.length());
     unsigned char* bp = b->getBuffer();
-    memcpy(bp, data.c_str(), data.length());
+    if (bp) {
+        memcpy(bp, data.c_str(), data.length());
+    }
     dynamic_cast<QPDF_Stream*>(obj.get())->replaceStreamData(
         b, filter, decode_parms);
 }
--
libgit2 0.21.4