diff options
| author | Noralf Trønnes <noralf@tronnes.org> | 2019-04-23 16:53:53 +0200 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2019-04-24 15:57:43 +0200 |
| commit | 1de7259275ca4ebc66459de6620558d3e38d4142 (patch) | |
| tree | acdb8a9f6a5920784b3e93185de4b9393f0f94a7 | |
| parent | b8c7d7bc8386924f57aac0a745ae3240f07b743b (diff) | |
drm/fb-helper: Fix drm_fb_helper_firmware_config() NULL pointer derefdrm-misc-next-fixes-2019-04-24
Non-atomic drivers like ast doesn't have connector->state set resulting
in a NULL pointer deref:
[ 29.609593] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 29.609619] Call Trace:
[ 29.609630] ? drm_helper_probe_single_connector_modes+0x27f/0x680
[ 29.609640] drm_setup_crtcs+0x431/0xd80 [drm_kms_helper]
[ 29.753065] __drm_fb_helper_initial_config_and_unlock+0x6f/0x6a0
[ 29.753160] ? drm_modeset_unlock_all+0x31/0x50 [drm]
[ 29.765758] ast_fbdev_init+0xa8/0xc0 [ast]
[ 29.765762] ast_driver_load.cold.7+0x2b3/0xe11 [ast]
[ 29.765775] drm_dev_register+0x111/0x150 [drm]
Fix by bailing out if the driver does not support atomic modesetting.
Fixes: 09ded8af57bc ("drm/i915/fbdev: Move intel_fb_initial_config() to fbdev helper")
Reported-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20190423145353.30158-1-noralf@tronnes.org
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 226c0910ba91..498f95c3e81d 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -2588,6 +2588,9 @@ static bool drm_fb_helper_firmware_config(struct drm_fb_helper *fb_helper, int num_connectors_detected = 0; struct drm_modeset_acquire_ctx ctx; + if (!drm_drv_uses_atomic_modeset(dev)) + return false; + save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL); if (!save_enabled) return false; |