[Bug translator/30395] Regex code has invalid memory reads caught by KASAN

[serhei at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=30395

Serhei Makarov <serhei at serhei dot io> changed:

           What    |Removed                     |Added
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                 CC|                            |serhei at serhei dot io

--- Comment #5 from Serhei Makarov <serhei at serhei dot io> ---
Taking a look at this problem. At first glance, it may be a case of
stapregex-dfa.cxx emit_final() needing to work differently when it is called as
a result of seeing the end NUL byte. It has some cases that continue on to the
next character if we accept in the middle of a string, which might be triggered
erroneously. Will need to go through the generated code more closely.

(The stapregex code is, in fact, a from-the-ground-up rewrite of the re2c
codebase which was... stylistically mismatched from our own coding style, to
put it mildly. So there is no option to 'just upgrade', alas.)

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