Mesa (master): egl: Display may be NULL in _eglLookup*.

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: 08a482e7a9d13db5d4e6fd974942f6699d7d49dc
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=08a482e7a9d13db5d4e6fd974942f6699d7d49dc

Author: Chia-I Wu <olv at lunarg.com>
Date:   Fri Sep 10 00:02:47 2010 +0800

egl: Display may be NULL in _eglLookup*.

This fixes several NULL dereferences.

---

 src/egl/main/eglconfig.h |    2 +-
 src/egl/main/eglmode.c   |    2 +-
 src/egl/main/eglscreen.c |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/egl/main/eglconfig.h b/src/egl/main/eglconfig.h
index ca63c40..0ad58cf 100644
--- a/src/egl/main/eglconfig.h
+++ b/src/egl/main/eglconfig.h
@@ -117,7 +117,7 @@ static INLINE _EGLConfig *
 _eglLookupConfig(EGLConfig config, _EGLDisplay *dpy)
 {
    _EGLConfig *conf = (_EGLConfig *) config;
-   if (!_eglCheckConfigHandle(config, dpy))
+   if (!dpy || !_eglCheckConfigHandle(config, dpy))
       conf = NULL;
    return conf;
 }
diff --git a/src/egl/main/eglmode.c b/src/egl/main/eglmode.c
index 37594cd..ed107d5 100644
--- a/src/egl/main/eglmode.c
+++ b/src/egl/main/eglmode.c
@@ -25,7 +25,7 @@ _eglLookupMode(EGLModeMESA mode, _EGLDisplay *disp)
 {
    EGLint scrnum;
 
-   if (!disp->Screens)
+   if (!disp || !disp->Screens)
       return NULL;
 
    /* loop over all screens on the display */
diff --git a/src/egl/main/eglscreen.c b/src/egl/main/eglscreen.c
index 8b8966f..9e39335 100644
--- a/src/egl/main/eglscreen.c
+++ b/src/egl/main/eglscreen.c
@@ -69,7 +69,7 @@ _eglLookupScreen(EGLScreenMESA screen, _EGLDisplay *display)
 {
    EGLint i;
 
-   if (!display->Screens)
+   if (!display || !display->Screens)
       return NULL;
 
    for (i = 0; i < display->Screens->Size; i++) {