0004-luci-lib-jsonc-Ignore-non-string-or-number-keys-in-tables.patch

From: Jan-Philipp Litza <janphilipp@litza.de>
Date: Sun, 30 Aug 2015 15:42:52 +0200
Subject: luci-lib-jsonc: Ignore non-string-or-number keys in tables

Previously, the following caused a segmentation fault:

    json.stringify({[{}] = true})

This was caused by lua_tostring() returning NULL for anything but
strings and numbers, letting json_object_object_add crash.

This patch makes jsonc ignore all keys which have no string
representation altogether.

Signed-off-by: Jan-Philipp Litza <janphilipp@litza.de>

diff --git a/libs/luci-lib-jsonc/src/jsonc.c b/libs/luci-lib-jsonc/src/jsonc.c
index 49cb21f..827fde8 100644
--- a/libs/luci-lib-jsonc/src/jsonc.c
+++ b/libs/luci-lib-jsonc/src/jsonc.c
@@ -286,8 +286,9 @@ static struct json_object * _lua_to_json(lua_State *L, int index)
 			lua_pushvalue(L, -2);
 			key = lua_tostring(L, -1);
 
-			json_object_object_add(obj, key,
-								   _lua_to_json(L, lua_gettop(L) - 1));
+			if (key)
+				json_object_object_add(obj, key,
+				                       _lua_to_json(L, lua_gettop(L) - 1));
 
 			lua_pop(L, 2);
 		}