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drm/vc4: hdmi: Don't access the connector state in reset if kmalloc fails

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[ Upstream commit e55a07751146ef8ebc2c561564437b78f46405d3 ]

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>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215154243.540115-5-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2020-12-15 16:42:38 +01:00 committed by Greg Kroah-Hartman
parent ba8ffdb450
commit c015d12317
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -209,7 +209,9 @@ static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
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 = {