From 3bc37f8fb297f48788ebb34ff7bdbed96566bd2a Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Dec 15 2016 06:48:02 +0000
Subject: __ntapi_tt_create_thread(): do not alter value of caller's params->reg_context.


---

diff --git a/src/thread/ntapi_tt_create_thread.c b/src/thread/ntapi_tt_create_thread.c
index 50a7d2f..f70d66f 100644
--- a/src/thread/ntapi_tt_create_thread.c
+++ b/src/thread/ntapi_tt_create_thread.c
@@ -157,9 +157,15 @@ int32_t __stdcall __ntapi_tt_create_thread(
 		status);
 
 	/* context */
-	if (!params->reg_context) {
-		params->reg_context = &context;
-		__ntapi->tt_aligned_block_memset(&context,0,sizeof(nt_thread_context));
+	if (params->reg_context) {
+		__ntapi->tt_aligned_block_memcpy(
+			(uintptr_t *)&context,
+			(uintptr_t *)params->reg_context,
+			sizeof(context));
+	} else {
+		__ntapi->tt_aligned_block_memset(
+			&context,0,sizeof(context));
+
 		__INIT_CONTEXT(context);
 		context.INSTRUCTION_POINTER_REGISTER = (uintptr_t)params->start;
 		context.STACK_POINTER_REGISTER = (uintptr_t)(stack.expandable_stack_base)
@@ -265,7 +271,7 @@ int32_t __stdcall __ntapi_tt_create_thread(
 		params->obj_attr,
 		params->hprocess,
 		&cid,
-		params->reg_context,
+		&context,
 		&stack,
 		fsuspended);