From 0c6ea4790dd6ad4101ac3c76172075e44833c106 Mon Sep 17 00:00:00 2001
From: Andy Piper <github@andypiper.com>
Date: Sat, 27 Jan 2024 16:36:35 +0000
Subject: [PATCH] AP_Common: fix initialization of ExpandingString so that it
 can be used on the stack

zero out passed in buffers for ExpandingString
---
 libraries/AP_Common/ExpandingString.cpp | 7 +++++++
 libraries/AP_Common/ExpandingString.h   | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/libraries/AP_Common/ExpandingString.cpp b/libraries/AP_Common/ExpandingString.cpp
index 9be2b3a91a..a3e7a8b401 100644
--- a/libraries/AP_Common/ExpandingString.cpp
+++ b/libraries/AP_Common/ExpandingString.cpp
@@ -25,6 +25,13 @@ extern const AP_HAL::HAL& hal;
 
 #define EXPAND_INCREMENT 512
 
+ExpandingString::ExpandingString(char* s, uint32_t total_len) : buf(0)
+{
+    set_buffer(s, total_len, 0);
+    memset(buf, 0, buflen);
+}
+
+
 /*
   expand the string buffer
  */
diff --git a/libraries/AP_Common/ExpandingString.h b/libraries/AP_Common/ExpandingString.h
index 2561332f3e..d92882e1b3 100644
--- a/libraries/AP_Common/ExpandingString.h
+++ b/libraries/AP_Common/ExpandingString.h
@@ -24,6 +24,8 @@
 
 class ExpandingString {
 public:
+    ExpandingString() : buf(0), buflen(0), used(0), allocation_failed(false), external_buffer(false) {}
+    ExpandingString(char* s, uint32_t total_len);
 
     const char *get_string(void) const {
         return buf;