From: Daniel Vetter Date: Fri, 14 Feb 2014 15:35:54 +0000 (+0100) Subject: drm/i915: fix NULL deref in the load detect code X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4c0e552882114d1edb588242d45035246ab078a0;p=openwrt%2Fstaging%2Fblogic.git drm/i915: fix NULL deref in the load detect code Looks like I've missed one of the potential NULL deref bugs in Jesse's fbdev->fb embedded struct to pointer conversions. Fix it up. This regression has been introduced in commit 8bcd45534ddf68ab71aeed709dacd9cf65dc0f75 Author: Jesse Barnes Date: Fri Feb 7 12:10:38 2014 -0800 drm/i915: alloc intel_fb in the intel_fbdev struct Cc: Jesse Barnes Reviewed-by: Jesse Barnes Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index fd860077d0fe..e0b7d06687f7 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7754,13 +7754,15 @@ mode_fits_in_fbdev(struct drm_device *dev, struct drm_i915_gem_object *obj; struct drm_framebuffer *fb; - if (dev_priv->fbdev == NULL) + if (!dev_priv->fbdev) return NULL; - obj = dev_priv->fbdev->fb->obj; - if (obj == NULL) + if (!dev_priv->fbdev->fb) return NULL; + obj = dev_priv->fbdev->fb->obj; + BUG_ON(!obj); + fb = &dev_priv->fbdev->fb->base; if (fb->pitches[0] < intel_framebuffer_pitch_for_width(mode->hdisplay, fb->bits_per_pixel))