#141 xetex crash on enough invalid utf-8

[karl berry]

as reported by leo liu on the tex-live list, xetex crashes on enough invalid utf-8 input. his files attached. the problem here is that a .png file is being \read (due to the multiple dots in the image filename -> treated as EPSF), so naturally there is tons of invalid UTF-8. but the point is, xetex shouldn't ever crash.

Invocation is just "xelatex 2.tex" ... thanks, karl.

[Akira Kakuto]

The following comment may not help, sorry.
It seems that the actual crash occurs at or near
the line 8348 in xetex.web:
cur_cmd:=eq_type(cur_cs); cur_chr:=equiv(cur_cs);

Akira

[Hironobu Yamashita]

It seems the following source is enough to force XeTeX crash:

% ================
\def\A{}
\openin1=badfile
\read1 to \A
\closein1
\edef\B{\A}
\end
% ================

The file being read ("badfile") contains only 4 bytes:
F4 A7 81 81

(These four bytes are not so specific, because other
byte sequences can also reproduce the crash.)

The files are attached.

Best,
Hironobu Yamashita

[Akira Kakuto]

I think that an attached patch XeTeX_ext.c.diff fixes the
problem. There are no crashes for badutf.tgz
and x3badfile.zip

Best,
Akira

[Hironobu Yamashita]

I think that an attached patch XeTeX_ext.c.diff fixes the problem.

It works! Thanks -- Hironobu

[Jonathan Kew]

Thanks for the patch, Akira; looks fine. I applied it to the SF repository, so this should be fixed for the next version.

[Jonathan Kew]

Should be fixed in b7ef352d2c0dd164f339eaf3d522cc752bb185c4.