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--- lua-5.1.4.orig/src/lstrlib.c 2008/07/11 17:27:21 1.132.1.4
+++ lua-5.1.4/src/lstrlib.c 2010/05/14 15:12:53
@@ -754,6 +754,7 @@
static int str_format (lua_State *L) {
+ int top = lua_gettop(L);
int arg = 1;
size_t sfl;
const char *strfrmt = luaL_checklstring(L, arg, &sfl);
@@ -768,7 +769,8 @@
else { /* format item */
char form[MAX_FORMAT]; /* to store the format (`%...') */
char buff[MAX_ITEM]; /* to store the formatted item */
- arg++;
+ if (++arg > top)
+ luaL_argerror(L, arg, "no value");
strfrmt = scanformat(L, strfrmt, form);
switch (*strfrmt++) {
case 'c': {
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