https://bugs.exim.org/show_bug.cgi?id=1638
Zoltan Herczeg <hzmester@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hzmester@???
--- Comment #1 from Zoltan Herczeg <hzmester@???> ---
The PCRE interpreter uses stack for recursion, and the machine stack can be
exhausted with well crafted patterns (those awful left recursive
(?BracketIndex) recursions...). The general solution is correctly setting
match_limit_recursion. PHP should _really_ do this.
However, this particular pattern revealed a bug in the zero length recursion
detector:
re> /^(?:(?(1)x|)+)+$()/B
------------------------------------------------------------------
0 33 Bra
3 ^
4 17 Bra
7 8 SCond
10 1 Cond ref
13 x
15 3 Alt
18 11 KetRmax
21 17 KetRmax
24 $
25 5 CBra 1
30 5 Ket
33 33 Ket
36 End
------------------------------------------------------------------
The second Bra (after 4 17) should be SBra.
Anyway, the serious problem is not setting the match_limit_recursion correctly.
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