[pcre-dev] [Bug 1058] Feeding bad utf8 strings confuses pcre…

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Autor: Philip Hazel
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Dla: pcre-dev
Temat: [pcre-dev] [Bug 1058] Feeding bad utf8 strings confuses pcre_exec()
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http://bugs.exim.org/show_bug.cgi?id=1058




--- Comment #1 from Philip Hazel <ph10@???> 2011-01-06 16:19:01 ---
On Wed, 5 Jan 2011, Alan Lehotsky wrote:

> If I feed a target string like "+\001\177" to pcre_exec() with a pattern of
> "[^a-z]", it appears that it grabs the trailing NUL on the string as being the
> second byte of a UTF8 character. It then returns a 'match' of {0,4}.
>
> But I suspect that this might be indicative of a more serious bug if you are
> using partial matches and the utf8 code point breaks across buffers,


I see you were using PCRE 7.9. Please re-check with the latest release,
8.11, which has the following change:

16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish
between a bad UTF-8 sequence and one that is incomplete when using
PCRE_PARTIAL_HARD.

There have also been other UTF-8 changes since 7.9.

Philip


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