From: Alin Nastac <alin.nastac@gmail.com>
Date: Mon, 3 Feb 2020 12:58:04 +0000 (+0100)
Subject: lua: avoid truncation of large numeric values
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=171469e3138cce191892e20b6fd35b52c9368064;p=project%2Fubus.git

lua: avoid truncation of large numeric values

If the Lua number exceeds the maximum value representable by an
unsigned 32bit integer, store it in an unsigned 64bit integer
field instead.

Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
[align code style, reword commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---

diff --git a/lua/ubus.c b/lua/ubus.c
index 86dcc50..e2bb081 100644
--- a/lua/ubus.c
+++ b/lua/ubus.c
@@ -196,7 +196,10 @@ ubus_lua_format_blob(lua_State *L, struct blob_buf *b, bool table)
 	case LUA_TINT:
 #endif
 	case LUA_TNUMBER:
-		blobmsg_add_u32(b, key, (uint32_t)lua_tointeger(L, -1));
+		if ((uint64_t)lua_tonumber(L, -1) > INT_MAX)
+			blobmsg_add_u64(b, key, (uint64_t)lua_tonumber(L, -1));
+		else
+			blobmsg_add_u32(b, key, (uint32_t)lua_tointeger(L, -1));
 		break;
 
 	case LUA_TSTRING: