Hello,
With xtt backend, loading a proportional iso10646 font always results
in X server crash. This is also responsible for some of the mysterious
mozilla crashing X problems. Because mozilla some times load iso10646 font
even without user's explicit request. The problem is caused by the following
code inside the "freetype_compute_bounds" function in
xc/extras/X-TrueType/xttfuncs.c (between line 1073 and 1114):
xCharInfo *tmpchar = NULL;
...
for (row = ...) {
for (col = ...) {
c = row<<8|col;
...
if (c)
tmpchar = get_metrics( ... );
if (!tmpchar->characterWidth)
^^^^^^^^
...
}
}
The above code loop through all characters in an encoding to get their
metrics. If the very first "c" is 0, there's a problem of referencing
null pointer "tmpchar" at where I marked with ^. For most of the encodings
in xtt implementation, character does not start from 0. Iso10646 is one
of a few that does, thus manifest the problem. The problem exists in all
versions of 4.x.
A trivial fix is attached.
Regards,
rigel
--- xc/extras/X-TrueType/xttfuncs.c.orig Sun Mar 31 00:56:14 2002
+++ xc/extras/X-TrueType/xttfuncs.c Mon Apr 1 22:27:28 2002
@@ -1100,7 +1100,7 @@
char_width);
}
- if (!tmpchar->characterWidth)
+ if (!tmpchar || !tmpchar->characterWidth)
continue;
adjust_min_max(&minchar, &maxchar, tmpchar);
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