drm/i915/fbdev: Check for the framebuffer before use

If the fbdev probing fails, and in our error path we fail to clear the
dev_priv->fbdev, then we can try and use a dangling fbdev pointer, and
in particular a NULL fb. This could also happen in pathological cases
where we try to operate on the fbdev prior to it being probed.

Reported-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1468431285-28264-2-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index ef17d88..23129dc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -782,7 +782,7 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
        struct intel_fbdev *ifbdev = dev_priv->fbdev;
        struct fb_info *info;
 
-       if (!ifbdev)
+       if (!ifbdev || !ifbdev->fb)
                return;
 
        info = ifbdev->helper.fbdev;
@@ -827,31 +827,28 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
 
 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 {
-       struct drm_i915_private *dev_priv = to_i915(dev);
-       if (dev_priv->fbdev)
-               drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
+       struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
+
+       if (ifbdev && ifbdev->fb)
+               drm_fb_helper_hotplug_event(&ifbdev->helper);
 }
 
 void intel_fbdev_restore_mode(struct drm_device *dev)
 {
-       int ret;
-       struct drm_i915_private *dev_priv = to_i915(dev);
-       struct intel_fbdev *ifbdev = dev_priv->fbdev;
-       struct drm_fb_helper *fb_helper;
+       struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 
        if (!ifbdev)
                return;
 
        intel_fbdev_sync(ifbdev);
+       if (!ifbdev->fb)
+               return;
 
-       fb_helper = &ifbdev->helper;
-
-       ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
-       if (ret) {
+       if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper)) {
                DRM_DEBUG("failed to restore crtc mode\n");
        } else {
-               mutex_lock(&fb_helper->dev->struct_mutex);
+               mutex_lock(&dev->struct_mutex);
                intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
-               mutex_unlock(&fb_helper->dev->struct_mutex);
+               mutex_unlock(&dev->struct_mutex);
        }
 }