From: Paulo Alcantara <pcacjr@profusion.mobi>
Date: Fri, 17 Aug 2012 17:08:10 +0000 (-0300)
Subject: egl_dri2: Fix segmentation fault
X-Git-Tag: accepted/2.0alpha-wayland/20121114.171706~409
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b41f36bde778e6b11129f51de423b7c3aece26b4;p=profile%2Fivi%2Fmesa.git

egl_dri2: Fix segmentation fault

The segmentation fault occurs when DRI2 is not loaded up and
dri2_setup_screen() function deferences dri2_dpy->dri2 (since it's NULL
at this point).

This patch fixes the segmentation fault by checking if dri2 pointer is
not NULL before deferencing it.

Signed-off-by: Paulo Alcantara <pcacjr@profusion.mobi>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Brian Paul <brianp@vmware.com>
---

diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 423d18d..7326b85 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -481,7 +481,7 @@ dri2_setup_screen(_EGLDisplay *disp)
    assert(dri2_dpy->dri2 || dri2_dpy->swrast);
    disp->Extensions.KHR_surfaceless_context = EGL_TRUE;
 
-   if (dri2_dpy->dri2->base.version >= 3) {
+   if (dri2_dpy->dri2 && dri2_dpy->dri2->base.version >= 3) {
       disp->Extensions.KHR_create_context = EGL_TRUE;
 
       if (dri2_dpy->robustness)