From 59a23f03860d345582243cdfcf1f4e1c52489d73 Mon Sep 17 00:00:00 2001
From: Don HO <don.h@free.fr>
Date: Mon, 6 Jun 2016 09:56:36 +0200
Subject: [PATCH] Fix a crash issue due to CmdLineParams

CmdLineParams object of the block "case COPYDATA_PARAMS" is always made
by another instance of Notepad++, (located usually in C:\Program Files
(x86)\Notepad++\) which is launched by NppShell.dll.
If CmdLineParams structure is modified in the local instance, and file
is opened via NppShell.dll, then crash happeds.
---
 PowerEditor/src/NppBigSwitch.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/PowerEditor/src/NppBigSwitch.cpp b/PowerEditor/src/NppBigSwitch.cpp
index 85d60a6d..d999c814 100644
--- a/PowerEditor/src/NppBigSwitch.cpp
+++ b/PowerEditor/src/NppBigSwitch.cpp
@@ -529,8 +529,19 @@ LRESULT Notepad_plus::process(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lPa
 			{
 				case COPYDATA_PARAMS:
 				{
-					CmdLineParams *cmdLineParam = (CmdLineParams *)pCopyData->lpData;
-					pNppParam->setCmdlineParam(*cmdLineParam);
+					CmdLineParams *cmdLineParam = (CmdLineParams *)pCopyData->lpData; // CmdLineParams object from another instance
+					auto cmdLineParamsSize = static_cast<size_t>(pCopyData->cbData);  // CmdLineParams size from another instance
+					if (sizeof(CmdLineParams) == cmdLineParamsSize) // make sure the structure is the same
+					{
+						pNppParam->setCmdlineParam(*cmdLineParam);
+					}
+					else
+					{
+#ifdef DEBUG 
+						printStr(TEXT("sizeof(CmdLineParams) != cmdLineParamsSize\rCmdLineParams is formed by an instance of another version,\rwhereas your CmdLineParams has been modified in this instance."));
+#endif
+					}
+
 					NppGUI nppGui = (NppGUI)pNppParam->getNppGUI();
 					nppGui._isCmdlineNosessionActivated = cmdLineParam->_isNoSession;
 					break;