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drm/nouveau/fbcon: fix NULL pointer access in nouveau_fbcon_destroy

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When the fbcon object is initialized, but nouveau_fbcon_create is not
called, we run into a NULL pointer access within nouveau_fbcon_create when
unloading nouveau.

The call to drm_fb_helper_funcs.fb_probe is deferred until there is a
display for real since 4.14, that's why fbcon->helper.fb is still not set.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Karol Herbst 2017-11-06 16:20:33 +01:00 committed by Ben Skeggs
parent d34ded7ece
commit 34112bf493
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/nouveau/nouveau_fbcon.c
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@ -429,7 +429,7 @@ nouveau_fbcon_destroy(struct drm_device *dev, struct nouveau_fbdev *fbcon)
drm_fb_helper_unregister_fbi(&fbcon->helper);
drm_fb_helper_fini(&fbcon->helper);
if (nouveau_fb->nvbo) {
if (nouveau_fb && nouveau_fb->nvbo) {
nouveau_vma_del(&nouveau_fb->vma);
nouveau_bo_unmap(nouveau_fb->nvbo);
nouveau_bo_unpin(nouveau_fb->nvbo);