From: Chen-Yu Tsai Date: Fri, 17 Feb 2017 03:13:26 +0000 (+0800) Subject: drm/sun4i: Check return value of drm_vblank_init X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=92b300c4e6f7f6fc22e1cc02d7c07627769a6339;p=openwrt%2Fstaging%2Fblogic.git drm/sun4i: Check return value of drm_vblank_init drm_vblank_init can fail due to insufficient memory. Ignoring the error and proceeding may cause the kernel to dereference an invalid pointer when vblank is enabled. Signed-off-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard --- diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c index 7ae179e88309..46887c3044d0 100644 --- a/drivers/gpu/drm/sun4i/sun4i_drv.c +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -102,7 +102,11 @@ static int sun4i_drv_bind(struct device *dev) } drm->dev_private = drv; - drm_vblank_init(drm, 1); + /* drm_vblank_init calls kcalloc, which can fail */ + ret = drm_vblank_init(drm, 1); + if (ret) + goto free_drm; + drm_mode_config_init(drm); ret = component_bind_all(drm->dev, drm);