On Sat, 2023-10-07 at 11:17 +0800, Ma Ke wrote: > In ch7006_encoder_get_modes(), the return value of drm_mode_duplicate() > is assigned to mode, which will lead to a NULL pointer dereference > on failure of drm_mode_duplicate(). Add a check to avoid npd. > > Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx> > --- > drivers/gpu/drm/i2c/ch7006_drv.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i2c/ch7006_drv.c b/drivers/gpu/drm/i2c/ch7006_drv.c > index 131512a5f3bd..27c2f02f5b43 100644 > --- a/drivers/gpu/drm/i2c/ch7006_drv.c > +++ b/drivers/gpu/drm/i2c/ch7006_drv.c > @@ -236,8 +236,10 @@ static int ch7006_encoder_get_modes(struct drm_encoder *encoder, > ~mode->valid_norms & 1<<priv->norm) > continue; > > - drm_mode_probed_add(connector, > - drm_mode_duplicate(encoder->dev, &mode->mode)); > + struct drm_display_mode *encoder_mode; > + encoder_mode = drm_mode_duplicate(encoder->dev, &mode->mode); I think the kernel prefers to have variable declaration at the top of the scope, and as well: this breaks things because you don't add back the drm_mode_probed_add() call. > + if (!mode) > + continue; > > n++; > } -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat
