From: Tomasz Figa Date: Tue, 10 Jun 2014 20:57:57 +0000 (+0200) Subject: drm/exynos: dpi: Fix NULL pointer dereference with legacy bindings X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=aaa51b13ffdc87ffbbde650bab9dee0a9c5c408f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/exynos: dpi: Fix NULL pointer dereference with legacy bindings If there is no panel node in DT and instead display timings are provided directly in FIMD node, there is no panel object created and ctx->panel becomes NULL. However during Exynos DRM initialization drm_helper_hpd_irq_event() is called, which in turns calls exynos_dpi_detect(), which dereferences ctx->panel without a check, causing a NULL pointer derefrence. This patch fixes the issue by adding necessary NULL pointer check. Signed-off-by: Tomasz Figa Reviewed-by: Jingoo Han Signed-off-by: Inki Dae --- diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c index 482127f633c5..9e530f205ad2 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c @@ -40,7 +40,7 @@ exynos_dpi_detect(struct drm_connector *connector, bool force) { struct exynos_dpi *ctx = connector_to_dpi(connector); - if (!ctx->panel->connector) + if (ctx->panel && !ctx->panel->connector) drm_panel_attach(ctx->panel, &ctx->connector); return connector_status_connected;