Bug#518131: libqt4-opengl: dlclose libQtOpenGL.so segmentation fault

[Tobias Rautenkranz <tobiasrautenkranz@web.de>]

Package: libqt4-opengl
Version: 4.5.0~rc1-2
Severity: minor

If libQtOpenGL is loaded with dlopen the program segfaults when libQtOpenGL is unloaded.

$ gcc -o dltest -ldl dltest.c
$ ./dltest /usr/lib/libQtOpenGL.so
opening /usr/lib/libQtOpenGL.so...
closing /usr/lib/libQtOpenGL.so...
Segmentation fault (core dumped)

My build from upstream links against GLU and does not crash on dlclose.

$ ldd /usr/lib/libQtOpenGL.so | grep GLU
$ ldd /usr/local/Trolltech/Qt-4.5.0/lib/libQtOpenGL.so | grep GLU
         libGLU.so.1 => /usr/lib/libGLU.so.1 (0xb7e01000)

Linking libqt4-opengl against GLU should fix it.

$ ./dltest /usr/lib/libGLU.so /usr/lib/libQtOpenGL.so
opening /usr/lib/libGLU.so...
opening /usr/lib/libQtOpenGL.so...
closing /usr/lib/libQtOpenGL.so...
closing /usr/lib/libGLU.so...
done


-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-1-686 (SMP w/1 CPU core)
Locale: LANG=de_CH.UTF-8, LC_CTYPE=de_CH.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libqt4-opengl depends on:
ii  libc6                        2.9-4       GNU C Library: Shared libraries
ii  libfreetype6                 2.3.7-2     FreeType 2 font engine, shared lib
ii  libgcc1                      1:4.3.3-3   GCC support library
ii  libgl1-mesa-glx [libgl1]     7.2-1       A free implementation of the OpenG
ii  libqtcore4                   4.5.0~rc1-2 Qt 4 core module
ii  libqtgui4                    4.5.0~rc1-2 Qt 4 GUI module
ii  libstdc++6                   4.3.3-3     The GNU Standard C++ Library v3
ii  libx11-6                     2:1.1.5-2   X11 client-side library

libqt4-opengl recommends no packages.

libqt4-opengl suggests no packages.

-- no debconf information

#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <error.h>

int
main(int argc, char** argv)
{
	if (argc < 2)
		error(EXIT_FAILURE, 0, "usage: %s LIBRARY...", argv[0]);

	void* handle[argc];
	int i;
	for (i=1; i < argc; i++)
	{
		printf("opening %s...\n", argv[i]);
		handle[i] = dlopen(argv[i], RTLD_LAZY);
		if (!handle[i])
			error(EXIT_FAILURE, 0, "dlopen: %s", dlerror());
	}

	for (i=argc-1; i > 0; i--)
	{
		printf("closing %s...\n", argv[i]);
		if(dlclose(handle[i]))
			error(EXIT_FAILURE, 0, "dlclose: %s", dlerror());
	}

	printf("done\n");
	exit(EXIT_SUCCESS);
}