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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2018-04-27 22:40:21 +0300 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2018-05-20 10:16:59 +0300 |
| commit | 643ca198aacc671f32ef7c0c2783f0b539070a36 (patch) | |
| tree | 6729fa8e0de4d819811fe72c2e9f12893b84abc7 /drivers | |
| parent | 60cc43fc888428bb2f18f08997432d426a243338 (diff) | |
| download | linux-stable-643ca198aacc671f32ef7c0c2783f0b539070a36.tar.gz linux-stable-643ca198aacc671f32ef7c0c2783f0b539070a36.tar.bz2 linux-stable-643ca198aacc671f32ef7c0c2783f0b539070a36.zip | |
drm: rcar-du: lvds: Fix crash in .atomic_check when disabling connector
The connector .atomic_check() handler can be called with a NULL crtc
pointer in the connector state when the connector gets disabled
explicitly (through performing a legacy mode set or setting the
connector's CRTC_ID property to 0). This causes a crash as the crtc
pointer is dereferenced without any check.
Fix it by returning from the .atomic_check() handler when then crtc
pointer is NULL, as there is no check to be performed when the connector
gets disabled.
Fixes: c6a27fa41fab ("drm: rcar-du: Convert LVDS encoder code to bridge driver")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_lvds.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c index 3d2d3bbd1342..155ad840f3c5 100644 --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c @@ -88,6 +88,9 @@ static int rcar_lvds_connector_atomic_check(struct drm_connector *connector, const struct drm_display_mode *panel_mode; struct drm_crtc_state *crtc_state; + if (!state->crtc) + return 0; + if (list_empty(&connector->modes)) { dev_dbg(lvds->dev, "connector: empty modes list\n"); return -EINVAL; |