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scan: fix typo in UTF-8 escape

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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.
This commit is contained in:
Akim Demaille
2021-08-03 10:19:37 +02:00
parent e14825ecb7
commit 952479fca7
2 changed files with 29 additions and 24 deletions
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2
src/scan-gram.l
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@@ -160,7 +160,7 @@ xint 0[xX][0-9abcdefABCDEF]+
eol \n|\r\n
/* UTF-8 Encoded Unicode Code Point, from Flex's documentation. */
mbchar [\x09\x0A\x0D\x20-\x7E]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF]([\x80-\xBF]{2})|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x\90-\xBF]([\x80-\xBF]{2})|[\xF1-\xF3]([\x80-\xBF]{3})|\xF4[\x80-\x8F]([\x80-\xBF]{2})
mbchar [\x09\x0A\x0D\x20-\x7E]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF]([\x80-\xBF]{2})|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF]([\x80-\xBF]{2})|[\xF1-\xF3]([\x80-\xBF]{3})|\xF4[\x80-\x8F]([\x80-\xBF]{2})
/* Zero or more instances of backslash-newline. Following GCC, allow
white space between the backslash and the newline. */