fix a crasher in our EGL wrapper when attrib_list is NULL in eglChooseConfig

the EGL specification states that this should be treated as though it was
an empty list terminated with EGL_NONE.

Change-Id: I294104370a86b5e5c34c7bcf15c5459eab464631

1 files changed, 7 insertions, 2 deletions

diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index b6e0aae74e..7cb01d0e1a 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -1525,8 +1525,13 @@ EGLBoolean eglChooseConfig( EGLDisplay dpy, const EGLint *attrib_list,
     }
 
     if (ggl_unlikely(attrib_list==0)) {
-        *num_config = 0;
-        return EGL_TRUE;
+        /*
+         * A NULL attrib_list should be treated as though it was an empty
+         * one (terminated with EGL_NONE) as defined in
+         * section 3.4.1 "Querying Configurations" in the EGL specification.
+         */
+        static const EGLint dummy = EGL_NONE;
+        attrib_list = &dummy;
     }
 
     int numAttributes = 0;