[Mesa-dev] [Bug 75335] New: Use of uninitialized pointer in 'gallium_screen_create()'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75335

          Priority: medium
            Bug ID: 75335
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: Use of uninitialized pointer in
                    'gallium_screen_create()'
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: christian.prochaska at genode-labs.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Other
           Product: Mesa

(git master 9b2fe7cf96dc25f52ae43c8dfda20ee354c329f2)

I've built Mesa with the following configuration:

./autogen.sh --enable-gles2 --disable-glx --with-dri-drivers=
--enable-gallium-egl --with-egl-platforms=drm --with-gallium-drivers=i915

When running the 'es2gears' example, a segmentation fault occurs.

Backtrace:

----------
Starting program:
/home/christian/projects/mesa/demos/src/egl/opengles2/./es2gears 
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library
"/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0xb71f1505 in pipe_loader_create_screen (dev=0xb71f1378
<gallium_screen_create+8>, library_paths=0xb72fb3c0
"/usr/local/lib/gallium-pipe") at pipe_loader.c:68
68       return dev->ops->create_screen(dev, library_paths);
(gdb) bt
#0  0xb71f1505 in pipe_loader_create_screen (dev=0xb71f1378
<gallium_screen_create+8>, library_paths=0xb72fb3c0
"/usr/local/lib/gallium-pipe") at pipe_loader.c:68
#1  0xb71f13ab in gallium_screen_create (gdrm=gdrm at entry=0x8053fc0) at gbm.c:60
#2  0xb71f1d15 in gbm_gallium_drm_device_create (fd=7) at gbm_drm.c:248
#3  0xb7d6e643 in _gbm_create_device (fd=fd at entry=7) at main/backend.c:117
#4  0xb7d6e07f in gbm_create_device (fd=fd at entry=7) at main/gbm.c:155
#5  0xb77eae05 in native_create_display (dpy=0x0, use_sw=0 '\000') at
drm/native_drm.c:246
#6  0xb77e755b in egl_g3d_initialize (drv=0x8053990, dpy=0x804f008) at
common/egl_g3d.c:539
#7  0xb7fbed32 in _eglMatchAndInitialize (dpy=<optimized out>) at
egldriver.c:605
#8  0xb7fbf0e4 in _eglMatchDriver (dpy=dpy at entry=0x804f008,
test_only=test_only at entry=0) at egldriver.c:636
#9  0xb7fb9dc8 in eglInitialize (dpy=0x804f008, major=0x804e42c
<_eglut_state+44>, minor=0x804e430 <_eglut_state+48>) at eglapi.c:318
#10 0x0804bdfa in eglutInit (argc=1, argv=0xbffff754) at ../eglut/eglut.c:219
#11 0x0804b324 in main (argc=1, argv=0xbffff754) at es2gears.c:707
(gdb) 
----------

The error seems to be caused by the use of an uninitialized pointer in
'gallium_screen_create()':

----------
int
gallium_screen_create(struct gbm_gallium_drm_device *gdrm)
{
   struct pipe_loader_device *dev;
#ifdef HAVE_PIPE_LOADER_DRM
   int ret;

   ret = pipe_loader_drm_probe_fd(&dev, gdrm->base.base.fd, true);
   if (!ret)
      return -1;
#endif /* HAVE_PIPE_LOADER_DRM */

   gdrm->screen = pipe_loader_create_screen(dev, get_library_search_path());
----------

With my configuration, HAVE_PIPE_LOADER_DRM is not defined, so the 'dev'
pointer does not get initialized.

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