linux-kernel - [PATCH] ASoC: codecs: Fix to avoid potential NULL pointer dereferences

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Date:   Mon, 18 Mar 2019 19:58:01 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Barry Song <baohua@...nel.org>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: codecs: Fix to avoid potential NULL pointer dereferences

In sirf_audio_codec_driver_probe, of_match_node may fail and return a
NULL pointer. The patch avoids a potential NULL pointer dereference.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 sound/soc/codecs/sirf-audio-codec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/sirf-audio-codec.c b/sound/soc/codecs/sirf-audio-codec.c
index e424499a8450..fd2bbd6a3c58 100644
--- a/sound/soc/codecs/sirf-audio-codec.c
+++ b/sound/soc/codecs/sirf-audio-codec.c
@@ -464,6 +464,8 @@ static int sirf_audio_codec_driver_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 
 	match = of_match_node(sirf_audio_codec_of_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 
 	sirf_audio_codec = devm_kzalloc(&pdev->dev,
 		sizeof(struct sirf_audio_codec), GFP_KERNEL);
-- 
2.17.1