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authorJosé Expósito <jose.exposito89@gmail.com>2022-11-10 16:47:52 +0300
committerMaxime Ripard <maxime@cerno.tech>2022-11-15 12:06:39 +0300
commit0a99962c0dbfa461ac5965c99cce1149ccfa17ed (patch)
treeb5848e31fef53763bbb42f5094febba65a84398d
parentd218750805a3a07d734a093355be286dc04278ba (diff)
downloadlinux-0a99962c0dbfa461ac5965c99cce1149ccfa17ed.tar.xz
drm/vc4: hdmi: Fix pointer dereference before check
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 <jose.exposito89@gmail.com> Link: https://lore.kernel.org/r/20221110134752.238820-3-jose.exposito89@gmail.com Signed-off-by: Maxime Ripard <maxime@cerno.tech>
-rw-r--r--drivers/gpu/drm/vc4/vc4_hdmi.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index a49f88e5d2b9..6b223a5fcf6f 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;