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bug: 'io.lines' does not check maximum number of options

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This commit is contained in:
Roberto Ierusalimschy 2015-07-15 11:40:28 -03:00
parent 2b61360d82
commit 050e8536bb
1 changed files with 8 additions and 1 deletions
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9
liolib.c
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@ -1,5 +1,5 @@
/*
** $Id: liolib.c,v 2.145 2015/06/21 13:50:29 roberto Exp roberto $
** $Id: liolib.c,v 2.146 2015/07/07 17:03:34 roberto Exp roberto $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
@ -318,8 +318,15 @@ static int io_output (lua_State *L) {
static int io_readline (lua_State *L);
/*
** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
** in the limit for upvalues of a closure)
*/
#define MAXARGLINE 250
static void aux_lines (lua_State *L, int toclose) {
int n = lua_gettop(L) - 1; /* number of arguments to read */
luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
lua_pushinteger(L, n); /* number of arguments to read */
lua_pushboolean(L, toclose); /* close/not close file when finished */
lua_rotate(L, 2, 2); /* move 'n' and 'toclose' to their positions */