Hi Fons,
If zita-rev1 cannot connext to a X-server it segfaults. The problem is
actually in libclxclient-3.6.1, xdisplay.cc.
X_display::X_display() .. constructor bails out early if it cannot
connect to X11 (and does not allocate the XImages) - but the
X_display::~X_display() destructor resets the data and calls
XDestroyImage() for those XImages - which may cause a segfault.
Attached patch is one possible solution.
Cheers!
robin
-=-=-=-=-=-
sudo su - nobody
gdb ./zita-rev1
#[..]
(gdb) run
Can't open display.
Program received signal SIGSEGV, Segmentation fault.
0xb7eae307 in X_display::~X_display() () from /usr/lib/libclxclient.so.3
(gdb) bt
#0 0xb7eae307 in X_display::~X_display() () from /usr/lib/libclxclient.so.3
#1 0x0804abdd in main (ac=1, av=0xbffffd94) at zita-rev1.cc:87
(gdb)
On 06/26/2013 07:52 PM, Alexandre Rebert wrote:
> Hi,
>
> We found a crash in zita-rev1 contained in the zita-rev1 package. You are
> being
> contacted because your are listed as one of the maintainer of zita-rev1.
>
> We are planning to submit the bug to the Debian bug tracking system in two
> weeks. We wanted to give you a heads-up, so that you some time to assess the
> seriousness of the bug before it is publicly disclosed.
>
> The bug report that will be submitted to the bug tracker is available at the
> following url:
>
>
> http://www.forallsecure.com/bug-reports/db7635e9e0fccad4d41a93ca1b2fe3ceea2eee5e/
>
> This email is part of a mass bug reporting campain comprising 1,182 bugs. You
> might have received multiple emails from us concerning different programs.
> More
> information about the mass bug reporting is available on the debian-devel
> mailing list:
>
> http://lists.debian.org/debian-devel/2013/06/msg00720.html
>
> Regards,
> The Mayhem Team
> Cylab, Carnegie Mellon University
--- clxclient-3.6.1/xdisplay.cc 2013-06-27 17:30:44.520034390 +0200
+++ clxclient-3.6.1/xdisplay.cc.fixed 2013-06-27 17:30:40.452014218 +0200
@@ -55,13 +55,14 @@
X_display::~X_display (void)
{
int i;
+ if (!_dpy) return;
for (i = 0; i < N_IMG1515; i++)
{
_imgptr1515 [i]->data = 0;
XDestroyImage (_imgptr1515 [i]);
}
- if (_dpy) XCloseDisplay (_dpy);
+ XCloseDisplay (_dpy);
}
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