Re: Seg fault with HTML::Parser

[Chip Salzenberg <chip@debian.org>]

According to Gisle Aas:
>   (xxx.pl:4)      pushmark
>       =>  \HV()  PV("</TD>"\0)  *  AV()  *
>   (xxx.pl:4)      const(IV(1))
>       =>  \HV()  PV("</TD>"\0)  *  AV()  *  IV(1)
>   (xxx.pl:4)      const(IV(505))
>       =>  \HV()  PV("</TD>"\0)  *  AV()  *  IV(1)  IV(505)
>   (xxx.pl:4)      repeat
>       =>  ... IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)
>   IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)  IV(1)
>   (xxx.pl:4)      push
>       =>  \HV()  PV("</TD>"\0)  IV(505)
>   (xxx.pl:4)      leavesub
>       =>   [STACK UNDERFLOW!!!]

Could this be a fencepost error in pp_repeat's usage of MEXTEND(),
resulting in writing past the end of the stack, but only when the
circumstances are carefully chosen?

Shirley, though, the odds that such a buffer overflow would result in
a later underflow is vanishingly small.  Like the ski resort populated
with girls looking for husbands and husbands looking for girls, the
situation is not as symmetrical as it first appears.
-- 
Chip Salzenberg               - a.k.a. -               <chip@pobox.com>
"I wanted to play hopscotch with the impenetrable mystery of existence,
    but he stepped in a wormhole and had to go in early."  // MST3K