From 0a99962c0dbfa461ac5965c99cce1149ccfa17ed Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jos=C3=A9=20Exp=C3=B3sito?= Date: Thu, 10 Nov 2022 14:47:52 +0100 Subject: [PATCH] drm/vc4: hdmi: Fix pointer dereference before check MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Commit 6bed2ea3cb38 ("drm/vc4: hdmi: Reset link on hotplug") introduced the vc4_hdmi_reset_link() function. This function dereferences the "connector" pointer before checking whether it is NULL or not. Rework variable assignment to avoid this issue. Fixes: 6bed2ea3cb38 ("drm/vc4: hdmi: Reset link on hotplug") Signed-off-by: José Expósito Link: https://lore.kernel.org/r/20221110134752.238820-3-jose.exposito89@gmail.com Signed-off-by: Maxime Ripard --- drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index a49f88e..6b223a5 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -318,8 +318,8 @@ out: static int vc4_hdmi_reset_link(struct drm_connector *connector, struct drm_modeset_acquire_ctx *ctx) { - struct drm_device *drm = connector->dev; - struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector); + struct drm_device *drm; + struct vc4_hdmi *vc4_hdmi; struct drm_connector_state *conn_state; struct drm_crtc_state *crtc_state; struct drm_crtc *crtc; @@ -330,6 +330,7 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector, if (!connector) return 0; + drm = connector->dev; ret = drm_modeset_lock(&drm->mode_config.connection_mutex, ctx); if (ret) return ret; @@ -347,6 +348,7 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector, if (!crtc_state->active) return 0; + vc4_hdmi = connector_to_vc4_hdmi(connector); if (!vc4_hdmi_supports_scrambling(vc4_hdmi)) return 0; -- 2.7.4