Akim Demaille 952479fca7 scan: fix typo in UTF-8 escape ...

We had:

```
-mbchar    ...|\xF0[\x\90-\xBF]([\x80-\xBF]{2})|...
+mbchar    ...|\xF0[\x90-\xBF]([\x80-\xBF]{2})|...
```

so a precise sequence that matches the incorrect regex can let NUL
bytes pass through, which triggers an assertion violation downstream.
It is a pity that Flex does not report an error for such input.

Reported by Ahcheong Lee <ahcheong.lee@gmail.com>.
<https://lists.gnu.org/r/bug-bison/2021-04/msg00003.html>

* src/scan-gram.l (mbchar): Fix the bad regex.
* tests/input.at (Invalid inputs): Check that case.

2021-08-03 12:22:52 +02:00

87 KiB

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