intel: added screen->dri2.loader null pointer check in intel_flush()

Fixes segfaults when rendering to front buffer.

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 56d03c1..3436b8e 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -400,7 +400,8 @@ intel_flush(GLcontext *ctx, GLboolean needs_mi_flush)
    if ((ctx->DrawBuffer->Name == 0) && intel->front_buffer_dirty) {
       __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 
-      if ((screen->dri2.loader->base.version >= 2)
+      if (screen->dri2.loader &&
+          (screen->dri2.loader->base.version >= 2)
          && (screen->dri2.loader->flushFrontBuffer != NULL)) {
         (*screen->dri2.loader->flushFrontBuffer)(intel->driDrawable,
                                                  intel->driDrawable->loaderPrivate);