Re: possible bug in liblua/lparser.c

[Patrick Donnelly <batrick () batbytes com>]

On Fri, Dec 3, 2010 at 3:35 AM, Vita Cizek <vcizek () suse cz> wrote:
> Hi,
> This appears in both 5.21 and devel versions.
> In liblua/lparser.c, close_func():
>
> The fs pointer points to a valid memory, it is dereferenced in
> a few places, thus can't be NULL at the test point, I guess.
>
> static void close_func (LexState *ls) {
>  lua_State *L = ls->L;
>  FuncState *fs = ls->fs;
>  Proto *f = fs->f;        <-- first dereferenced here
>
> ...
>
>  ls->fs = fs->prev;
>  L->top -= 2;  /* remove table and prototype from the stack */
>  /* last token read was anchored in defunct function; must reanchor it */
>  if (fs) anchor_token(ls);       <-- this NULL test
> }

This was recently brought up on the Lua mailing list. It is not a bug
and will be removed in a future version of Lua.

-- 
- Patrick Donnelly
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