From: Maarten Lankhorst Date: Tue, 22 Mar 2016 14:42:14 +0000 (+0100) Subject: drm/core: Fix ordering in drm_mode_config_cleanup. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f35034f8ac72925591ae96841fcbeebad1af1dc8;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/core: Fix ordering in drm_mode_config_cleanup. __drm_atomic_helper_plane_destroy_state calls drm_framebuffer_unreference, which means that if drm_framebuffer_free is called before plane->destroy freed memory will be accessed. A similar case happens for the blob list, which was freed before the crtc state was, resulting in the unreference_blob from crtc_destroy_state pointing to garbage memory causing another opportunity for a GPF. Signed-off-by: Maarten Lankhorst Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1458657734-21866-1-git-send-email-maarten.lankhorst@linux.intel.com --- diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 55ffde5a3a4a..f7fe9e153dec 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -5914,6 +5914,15 @@ void drm_mode_config_cleanup(struct drm_device *dev) drm_property_destroy(dev, property); } + list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list, + head) { + plane->funcs->destroy(plane); + } + + list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) { + crtc->funcs->destroy(crtc); + } + list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list, head_global) { drm_property_unreference_blob(blob); @@ -5932,15 +5941,6 @@ void drm_mode_config_cleanup(struct drm_device *dev) drm_framebuffer_free(&fb->refcount); } - list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list, - head) { - plane->funcs->destroy(plane); - } - - list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) { - crtc->funcs->destroy(crtc); - } - ida_destroy(&dev->mode_config.connector_ida); idr_destroy(&dev->mode_config.tile_idr); idr_destroy(&dev->mode_config.crtc_idr);