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| author | Giulio Benetti <giulio.benetti@micronovasrl.com> | 2018-10-05 23:59:51 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2018-11-06 16:55:29 +0100 |
| commit | a8939766c75c06b5a0ab691ecbba9347e4e520cf (patch) | |
| tree | c7830416d61fb780ef9e8369b00ca1806043d180 /drivers | |
| parent | 7f4cedd882f7cae83177066c2b239ef457ce4a42 (diff) | |
| download | linux-stable-a8939766c75c06b5a0ab691ecbba9347e4e520cf.tar.gz linux-stable-a8939766c75c06b5a0ab691ecbba9347e4e520cf.tar.bz2 linux-stable-a8939766c75c06b5a0ab691ecbba9347e4e520cf.zip | |
drm/sun4i: tcon: prevent tcon->panel dereference if NULL
If tcon->panel pointer is NULL, trying to dereference from it
(i.e. tcon->panel->connector) will cause a null pointer dereference.
Add tcon->panel null pointer check before calling
sun4i_tcon0_mode_set_dithering().
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Fixes: f11adcecbd5f ("drm/sun4i: tcon: Add dithering support for
RGB565/RGB666 LCD panels")
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181005215951.99003-2-giulio.benetti@micronovasrl.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index e4b3bd0307ef..f949287d926c 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -491,7 +491,8 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, sun4i_tcon0_mode_set_common(tcon, mode); /* Set dithering if needed */ - sun4i_tcon0_mode_set_dithering(tcon, tcon->panel->connector); + if (tcon->panel) + sun4i_tcon0_mode_set_dithering(tcon, tcon->panel->connector); /* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 0); |