| Message ID | 20181002215917.1849-2-giulio.benetti@micronovasrl.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer | expand |
On Wed, Oct 3, 2018 at 5:59 AM Giulio Benetti <giulio.benetti@micronovasrl.com> wrote: > > If using tcon with VGA, tcon->panel will be null(0), this will cause > segmentation fault when trying to dereference tcon->panel->connector. > > Add tcon->panel null 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>
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);
If using tcon with VGA, tcon->panel will be null(0), this will cause segmentation fault when trying to dereference tcon->panel->connector. Add tcon->panel null check before calling sun4i_tcon0_mode_set_dithering(). Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com> --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)