add checksig in OP_FORLOOP, see issue cloudwu#568

cloudwu · cloudwu · commit af6b5609de16 · 2017-01-23T16:50:34.000+08:00
diff --git a/3rd/lua/lvm.c b/3rd/lua/lvm.c
@@ -1201,6 +1201,7 @@ void luaV_execute (lua_State *L) {
         }
       }
       vmcase(OP_FORLOOP) {
+        lua_checksig(L);
         if (ttisinteger(ra)) {  /* integer loop? */
           lua_Integer step = ivalue(ra + 2);
           lua_Integer idx = intop(+, ivalue(ra), step); /* increment index */

Original file line number	Diff line number	Diff line change
`@@ -1201,6 +1201,7 @@ void luaV_execute (lua_State *L) {`
`1201`	`1201`	`}`
`1202`	`1202`	`}`
`1203`	`1203`	`vmcase(OP_FORLOOP) {`
	`1204`	`+ lua_checksig(L);`
`1204`	`1205`	`if (ttisinteger(ra)) { /* integer loop? */`
`1205`	`1206`	`lua_Integer step = ivalue(ra + 2);`
`1206`	`1207`	`lua_Integer idx = intop(+, ivalue(ra), step); /* increment index */`