From: Paul Cercueil Date: Tue, 10 Dec 2019 14:41:38 +0000 (+0100) Subject: gpu/drm: ingenic: Avoid null pointer deference in plane atomic update X-Git-Tag: v5.15~303^2~28^2~3855 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=354b051c5dcbeb35bbfd5d54161364fc7a75a58a;p=platform%2Fkernel%2Flinux-starfive.git gpu/drm: ingenic: Avoid null pointer deference in plane atomic update It is possible that there is no drm_framebuffer associated with a given plane state. v2: Handle drm_plane->state which can be NULL too Signed-off-by: Paul Cercueil Link: https://patchwork.freedesktop.org/patch/msgid/20191210144142.33143-2-paul@crapouillou.net # *** extracted tags *** Acked-by: Sam Ravnborg --- diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c index ec32e1c..43a015f 100644 --- a/drivers/gpu/drm/ingenic/ingenic-drm.c +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c @@ -372,14 +372,18 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane, struct ingenic_drm *priv = drm_plane_get_priv(plane); struct drm_plane_state *state = plane->state; unsigned int width, height, cpp; + dma_addr_t addr; - width = state->crtc->state->adjusted_mode.hdisplay; - height = state->crtc->state->adjusted_mode.vdisplay; - cpp = state->fb->format->cpp[plane->index]; + if (state && state->fb) { + addr = drm_fb_cma_get_gem_addr(state->fb, state, 0); + width = state->crtc->state->adjusted_mode.hdisplay; + height = state->crtc->state->adjusted_mode.vdisplay; + cpp = state->fb->format->cpp[plane->index]; - priv->dma_hwdesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0); - priv->dma_hwdesc->cmd = width * height * cpp / 4; - priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ; + priv->dma_hwdesc->addr = addr; + priv->dma_hwdesc->cmd = width * height * cpp / 4; + priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ; + } } static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,