renderer: guard call to glTexBuffer

We shouldn't call glTexBuffer unless we know the feature is enabled,
otherwise a rouge client might be able to crash the host.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
[airlied: fix whitespace]
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/vrend_renderer.c

@@ -3791,7 +3791,10 @@ static void vrend_draw_bind_images_shader(struct vrend_context *ctx, int shader_
 
          glBindBufferARB(GL_TEXTURE_BUFFER, iview->texture->id);
          glBindTexture(GL_TEXTURE_BUFFER, iview->texture->tbo_tex_id);
-         glTexBuffer(GL_TEXTURE_BUFFER, format, iview->texture->id);
+
+         if (has_feature(feat_arb_or_gles_ext_texture_buffer))
+            glTexBuffer(GL_TEXTURE_BUFFER, format, iview->texture->id);
+
          tex_id = iview->texture->tbo_tex_id;
          level = first_layer = 0;
          layered = GL_TRUE;