From 387dc6a1882b3362f51cd2c8f9b71aa8596b674f Mon Sep 17 00:00:00 2001
From: Vincent Herbet <github@arkshine.me>
Date: Tue, 10 Jul 2018 12:09:20 +0200
Subject: [PATCH] Fix a menu recursion issue (#471)

* Factorize menu close logic in show_menu()

* Use CS-specific player's m_iMenu offset instead of menuselect command
---
 amxmodx/CGameConfigs.h | 13 +++++++++
 amxmodx/amxmodx.cpp    | 65 +++++++++++++++++++++---------------------
 amxmodx/newmenus.cpp   | 11 +++----
 3 files changed, 52 insertions(+), 37 deletions(-)

diff --git a/amxmodx/CGameConfigs.h b/amxmodx/CGameConfigs.h
index 72f31358..3ced7691 100644
--- a/amxmodx/CGameConfigs.h
+++ b/amxmodx/CGameConfigs.h
@@ -166,6 +166,19 @@ class CGameConfigManager : public IGameConfigManager
 		StringHashMap<ITextListener_SMC*> m_customHandlers;
 };
 
+#define GET_OFFSET(classname, member)												\
+	static int member = -1;															\
+	if (member == -1)																\
+	{                                                                               \
+		TypeDescription type;                                                       \
+		if (!CommonConfig->GetOffsetByClass(classname, #member, &type) || type.fieldOffset < 0)\
+		{																			\
+			LogError(amx, AMX_ERR_NATIVE, "Invalid %s offset. Native %s is disabled", #member, __FUNCTION__);\
+			return 0;																\
+		}																			\
+		member = type.fieldOffset;                                                  \
+	}
+
 extern CGameConfigManager ConfigManager;
 extern IGameConfig *CommonConfig;
 
diff --git a/amxmodx/amxmodx.cpp b/amxmodx/amxmodx.cpp
index ee0eac70..2cfeec5e 100755
--- a/amxmodx/amxmodx.cpp
+++ b/amxmodx/amxmodx.cpp
@@ -1246,31 +1246,48 @@ static cell AMX_NATIVE_CALL get_user_team(AMX *amx, cell *params) /* 3 param */
 
 static cell AMX_NATIVE_CALL show_menu(AMX *amx, cell *params) /* 3 param */
 {
+	auto closeMenu = [amx](int index) -> int
+	{
+		auto pPlayer = GET_PLAYER_POINTER_I(index);
+
+		if (!pPlayer->ingame)
+		{
+			return 1;
+		}
+
+		pPlayer->keys = 0;
+		pPlayer->menu = 0;
+
+		// Fire newmenu callback so closing it can be handled by the plugin
+		if (!CloseNewMenus(pPlayer))
+		{
+			LogError(amx, AMX_ERR_NATIVE, "Plugin called menu_display when item=MENU_EXIT");
+			return 2;
+		}
+
+		if (g_bmod_cstrike)
+		{
+			GET_OFFSET("CBasePlayer", m_iMenu);
+			set_pdata<int>(pPlayer->pEdict, m_iMenu, 0);
+		}
+
+		return 0;
+	};
+
+	int index = params[1];
+
 	// If show_menu is called from within a newmenu callback upon receiving MENU_EXIT
 	// it is possible for this native to recurse. We need to close newmenus right away
 	// because the recursive call would otherwise modify/corrupt the static get_amxstring
 	// buffer mid execution. This will either display incorrect text or result in UTIL_ShowMenu
 	// running into an infinite loop.
-	int index = params[1];
 	if (index == 0)
 	{
 		for (int i = 1; i <= gpGlobals->maxClients; ++i)
 		{
-			CPlayer* pPlayer = GET_PLAYER_POINTER_I(i);
-
-			if (pPlayer->ingame)
+			if (closeMenu(i) == 2)
 			{
-				pPlayer->keys = 0;
-				pPlayer->menu = 0;
-
-				// Fire newmenu callback so closing it can be handled by the plugin
-				if (!CloseNewMenus(pPlayer))
-				{
-					LogError(amx, AMX_ERR_NATIVE, "Plugin called menu_display when item=MENU_EXIT");
-					return 0;
-				}
-
-				UTIL_FakeClientCommand(pPlayer->pEdict, "menuselect", "10", 0);
+				return 0;
 			}
 		}
 	}
@@ -1282,23 +1299,7 @@ static cell AMX_NATIVE_CALL show_menu(AMX *amx, cell *params) /* 3 param */
 			return 0;
 		}
 
-		CPlayer* pPlayer = GET_PLAYER_POINTER_I(index);
-
-		if (pPlayer->ingame)
-		{
-			pPlayer->keys = 0;
-			pPlayer->menu = 0;
-
-			// Fire newmenu callback so closing it can be handled by the plugin
-			if (!CloseNewMenus(pPlayer))
-			{
-				LogError(amx, AMX_ERR_NATIVE, "Plugin called menu_display when item=MENU_EXIT");
-				return 0;
-			}
-
-			UTIL_FakeClientCommand(pPlayer->pEdict, "menuselect", "10", 0);
-		}
-		else
+		if (closeMenu(index))
 		{
 			return 0;
 		}
diff --git a/amxmodx/newmenus.cpp b/amxmodx/newmenus.cpp
index 478be49e..5e6d0773 100755
--- a/amxmodx/newmenus.cpp
+++ b/amxmodx/newmenus.cpp
@@ -316,11 +316,6 @@ bool Menu::Display(int player, page_t page)
 
 	CPlayer *pPlayer = GET_PLAYER_POINTER_I(player);
 
-	pPlayer->keys = 0;
-	pPlayer->menu = 0;
-
-	UTIL_FakeClientCommand(pPlayer->pEdict, "menuselect", "10", 0);
-
 	pPlayer->keys = keys;
 	pPlayer->menu = menuId;
 	pPlayer->newmenu = thisId;
@@ -828,6 +823,12 @@ static cell AMX_NATIVE_CALL menu_display(AMX *amx, cell *params)
 		return 0;
 	}
 
+	if (g_bmod_cstrike)
+	{
+		GET_OFFSET("CBasePlayer", m_iMenu);
+		set_pdata<int>(pPlayer->pEdict, m_iMenu, 0);
+	}
+
 	int time = -1;
 	if (params[0] / sizeof(cell) >= 4)
 		time = params[4];