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From e1b4f5c3970e14abe197f328077b348b4969e68f Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Tue, 15 Dec 2020 16:42:38 +0100
Subject: [PATCH] drm/vc4: hdmi: Don't access the connector state in
reset if kmalloc fails
drm_atomic_helper_connector_reset uses kmalloc which, from an API
standpoint, can fail, and thus setting connector->state to NULL.
However, our reset hook then calls drm_atomic_helper_connector_tv_reset
that will access connector->state without checking if it's a valid
pointer or not.
Make sure we don't end up accessing a NULL pointer.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Suggested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -216,7 +216,9 @@ static int vc4_hdmi_connector_get_modes(
static void vc4_hdmi_connector_reset(struct drm_connector *connector)
{
drm_atomic_helper_connector_reset(connector);
- drm_atomic_helper_connector_tv_reset(connector);
+
+ if (connector->state)
+ drm_atomic_helper_connector_tv_reset(connector);
}
static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
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