Hi, Stuart:
Stuart Lee stuart.lee@mediatek.com 於 2023年11月10日 週五 上午9:29寫道：
Add error handling to check NULL input in mtk_drm_crtc_dma_dev_get function.
While display path is not configured correctly, none of crtc is established. So the caller of mtk_drm_crtc_dma_dev_get may pass input parameter *crtc as NULL, Which may cause coredump when we try to get the container of NULL pointer.
Applied to mediatek-drm-fixes [1], thanks.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?...
Regards, Chun-Kuang.
Fixes: cb1d6bcca542 ("drm/mediatek: Add dma dev get function") Signed-off-by: Stuart Lee stuart.lee@mediatek.com Cc: stable@vger.kernel.org
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index c277b9fae950..047c9a31d306 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -921,7 +921,14 @@ static int mtk_drm_crtc_init_comp_planes(struct drm_device *drm_dev,
struct device *mtk_drm_crtc_dma_dev_get(struct drm_crtc *crtc) {
struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
struct mtk_drm_crtc *mtk_crtc = NULL;if (!crtc)return NULL;mtk_crtc = to_mtk_crtc(crtc);if (!mtk_crtc)return NULL; return mtk_crtc->dma_dev;}
2.18.0