lede_packages/net/haproxy/patches/0003-BUG-MINOR-lua-executes-the-function-destroying-the-L.patch

From 49d319a677432b69c6a69ef5331ae2ed592075c9 Mon Sep 17 00:00:00 2001
From: Thierry FOURNIER <thierry.fournier@ozon.io>
Date: Wed, 12 Jul 2017 13:41:33 +0200
Subject: [PATCH 03/18] BUG/MINOR: lua: executes the function destroying the
 Lua session in safe mode

When we destroy the Lua session, we manipulates Lua stack,
so errors can raises. It will be better to catch these errors.

This patch should be backported in 1.6 and 1.7
(cherry picked from commit 75d0208009c3189b5d10793e08f27dd62a76c3ae)

Signed-off-by: Willy Tarreau <w@1wt.eu>
---
 src/hlua.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/hlua.c b/src/hlua.c
index 4c1c2d21..2d312804 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -876,9 +876,15 @@ void hlua_ctx_destroy(struct hlua *lua)
 	/* Purge all the pending signals. */
 	hlua_com_purge(lua);
 
+	if (!SET_SAFE_LJMP(lua->T))
+		return;
 	luaL_unref(lua->T, LUA_REGISTRYINDEX, lua->Mref);
-	luaL_unref(gL.T, LUA_REGISTRYINDEX, lua->Tref);
+	RESET_SAFE_LJMP(lua->T);
 
+	if (!SET_SAFE_LJMP(gL.T))
+		return;
+	luaL_unref(gL.T, LUA_REGISTRYINDEX, lua->Tref);
+	RESET_SAFE_LJMP(gL.T);
 	/* Forces a garbage collecting process. If the Lua program is finished
 	 * without error, we run the GC on the thread pointer. Its freed all
 	 * the unused memory.
@@ -889,9 +895,16 @@ void hlua_ctx_destroy(struct hlua *lua)
 	 * the garbage collection.
 	 */
 	if (lua->flags & HLUA_MUST_GC) {
+		if (!SET_SAFE_LJMP(lua->T))
+			return;
 		lua_gc(lua->T, LUA_GCCOLLECT, 0);
-		if (lua_status(lua->T) != LUA_OK)
+		RESET_SAFE_LJMP(lua->T);
+		if (lua_status(lua->T) != LUA_OK) {
+			if (!SET_SAFE_LJMP(gL.T))
+				return;
 			lua_gc(gL.T, LUA_GCCOLLECT, 0);
+			RESET_SAFE_LJMP(gL.T);
+		}
 	}
 
 	lua->T = NULL;
-- 
2.13.0