linux-kernel - [PATCH 4.14 126/189] drm/omap: check return value from soc_device

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Date:   Mon, 18 Jun 2018 10:13:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomi Valkeinen <tomi.valkeinen@...com>,
        Benoit Parrot <bparrot@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Sean Paul <seanpaul@...omium.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 126/189] drm/omap: check return value from soc_device_match

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomi Valkeinen <tomi.valkeinen@...com>

[ Upstream commit 4d6cb5e2fee52af17001e92950f0894304706ee4 ]

soc_device_match() can return NULL, so add a check and fail if
soc_device_match() fails.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-2-tomi.valkeinen@ti.com
Reviewed-by: Benoit Parrot <bparrot@...com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@...com>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/omapdrm/dss/hdmi4_core.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
@@ -926,8 +926,13 @@ int hdmi4_core_init(struct platform_devi
 {
 	const struct hdmi4_features *features;
 	struct resource *res;
+	const struct soc_device_attribute *soc;
 
-	features = soc_device_match(hdmi4_soc_devices)->data;
+	soc = soc_device_match(hdmi4_soc_devices);
+	if (!soc)
+		return -ENODEV;
+
+	features = soc->data;
 	core->cts_swmode = features->cts_swmode;
 	core->audio_use_mclk = features->audio_use_mclk;