linux-kernel - [PATCH v4 05/45] drm/connector: Check drm_connector

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Message-Id: <20231128-kms-hdmi-connector-state-v4-5-c7602158306e@kernel.org>
Date:   Tue, 28 Nov 2023 11:24:16 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        Jonathan Corbet <corbet@....net>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v4 05/45] drm/connector: Check drm_connector_init pointers
 arguments

All the drm_connector_init variants take at least a pointer to the
device, connector and hooks implementation.

However, none of them check their value before dereferencing those
pointers which can lead to a NULL-pointer dereference if the author
isn't careful.

Let's test those pointers instead and error out if any is NULL.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_connector.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index b0516505f7ae..2f60755dccdd 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -229,6 +229,9 @@ static int __drm_connector_init(struct drm_device *dev,
 	struct ida *connector_ida =
 		&drm_connector_enum_list[connector_type].ida;
 
+	if (!dev || !connector || !funcs)
+		return -EINVAL;
+
 	WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 		(!funcs->atomic_destroy_state ||
 		 !funcs->atomic_duplicate_state));

-- 
2.41.0