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Date:	Tue, 19 Mar 2019 21:42:47 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	LRN <lrn1986 AT gmail DOT com>
Cc:	cygwin AT cygwin DOT com
Subject:	Re: wcsxfrm() with empty locale crashes the runtime
Message-ID:	<20190319204247.GQ3908@calimero.vinschen.de>
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On Mar 19 22:28, LRN wrote:
> The testcase is attached. Running it with Cygwin-i386 leads to a crash. My
> guess is that the implementation is not POSIX-conformant and tries to
> dereference the first argument (NULL), even though the third argument is =
0.
>=20
> Tested with Cygwin-3.0.4.

> #include <wchar.h>
> #include <stdlib.h>
> #include <locale.h>
>=20
> int
> main ()
> {
>   wchar_t w[2] =3D { L'z', L'\0' };
>   setlocale (LC_ALL, "");
>   int l =3D wcsxfrm (NULL, w, 0);
>   return l;
> }

Thanks for the testcase.  The problem has been introduced in commit
c0d7d3e1a2fa (*) when it turned out that combining the LCMAP_SORTKEY and
LCMAP_BYTEREV flags to LCMapStringW(**) were not such a good idea after
all.  The fix at the time was to do the byte swap ourselves, but that
patch forgot to take a char count of 0 into account.

I pushed a patch and uploaded new developer snapshots to
https://cygwin.com/snapshots/

Pleas give them a try.


Thanks,
Corinna

(*) https://sourceware.org/git/gitweb.cgi?p=3Dnewlib-cygwin.git;a=3Dcommitd=
iff;h=3Dc0d7d3e1a2fa
(**) https://docs.microsoft.com/en-us/windows/desktop/api/winnls/nf-winnls-=
lcmapstringex

--=20
Corinna Vinschen
Cygwin Maintainer

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