Below is a copy of a bug report I just submitted at xfree86.org and
bugs.opera.com:
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Xutf8TextPropertyToTextList causes applications to segfault on Opera's
(7.11) _NET_WM_NAME property. Opera seems to have a terminating 0x00
in the string while e.g. Mozilla doesn't. I'm not sure if such a
terminating character is allowed, but certainly Xlib shouldn't cause a
segfault in such a case.
The problem was discovered when starting Opera crashed my Ion window
manager with UTF8 support enabled, but the following code also segfaults
after printing prop.value when argv[1] contains the window ID of an
Opera window (gotten with e.g. xwininfo). Setting prop.nitems to
strlen(prop.value) before the call removes the problem, but is not really
a solution.
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
int main(int argc, char*argv[])
{
Display *dpy;
Atom a;
XTextProperty prop;
char **list=NULL;
int n=0;
dpy=XOpenDisplay(NULL);
a=XInternAtom(dpy, "_NET_WM_NAME", False);
if(XGetTextProperty(dpy, strtoul(argv[1], NULL, 16), &prop, a)){
printf("%s\n", prop.value);
Xutf8TextPropertyToTextList(dpy, &prop, &list, &n);
}
}
The the problem has been witnessed in XFree86 4.2.1.1 and 4.3.0.
--
Tuomo
