Lua Variable access bug?

[Maxim Dounin]

Hello!

On Thu, May 17, 2012 at 07:42:45PM +0800, agentzh wrote:

> On Thu, May 17, 2012 at 5:02 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> > Shouldn't it be
> >
> > --- a/src/http/ngx_http_variables.c
> > +++ b/src/http/ngx_http_variables.c
> > @@ -2072,6 +2072,11 @@ ngx_http_variables_init_vars(ngx_conf_t
> >     v = cmcf->variables.elts;
> >     key = cmcf->variables_keys->keys.elts;
> >
> > +    for (n = 0; n < cmcf->variables_keys->keys.nelts; n++) {
> > +        av = key[n].value;
> > +        av->flags &= ~NGX_HTTP_VAR_INDEXED;
> > +    }
> > +
> >     for (i = 0; i < cmcf->variables.nelts; i++) {
> >
> >         for (n = 0; n < cmcf->variables_keys->keys.nelts; n++) {
> >
> >
> > instead?
> >
> 
> Yes, this patch is better and is more efficient :)

No, disregard this patch.  It will break things if new 
configuration will be rejected for some reason, as global in 
master will be left in an inconsistent state.  As a result 
incorrect worker processes will be spawn e.g. after abnormal 
termination of a worker process (or after SIGWINCH + SIGHUP 
sequence).

Allocating temporary copy of a variable looks like the only 
correct way.

Maxim Dounin