[Issue 11350] libphobos2 regex match segfaults when a rare HTTP header is received

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11350


Dmitry Olshansky <dmitry.olsh at gmail.com> changed:

           What    |Removed                     |Added
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--- Comment #1 from Dmitry Olshansky <dmitry.olsh at gmail.com> 2013-10-25 11:21:26 PDT ---
(In reply to comment #0)
> 
> It seems the bug is at:
> 
> /usr/include/dmd/phobos/std/regex.d  line 6348
> 
> 6537 public auto match(R, RegEx)(R input, RegEx re)
> 6538     if(isSomeString!R && is(RegEx == Regex!(BasicElementOf!R)))
> 6539 {
> 6540     return RegexMatch!(Unqual!(typeof(input)),ThompsonMatcher)(re, input);
> 6541 }
> 
> Maybe is an encoding problem, it seems the input is:
> >>> print "%c%c%c%c%c%c%c%c%c" % (0x64,0x61,0x97,0x48,0x34,0x53,0x54,0x65,0x46)
> da�H4STeF
>

Would be nice to see what pattern that is and how exactly the argument to it
looks like.

I tried to reproduce with this:

void main()
{
    import std.regex;

    ubyte[] header = [0x64,0x61,0x97,0x48,0x34,0x53,0x54,0x65,0x46];
    auto m = match(cast(char[]) header, regex("(.*?): (.*)$"));
    assert(m.empty);
}

I get:

std.utf.UTFException at C:\dmd2\windows\bin\..\..\src\phobos\std\utf.d(1113):
Invalid UTF-8 sequence (at index 1)

No crashes.
Now it may have to do with shared object / PIC code for all I know, as I'm
testing on Win32.

But w/o a smaller or at least complete reproduceble test-case there is nothing
to work on.

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