ASoC: samsung: odroid: fix an use-after-free issue for codec

The codec variable is still being used after the of_node_put() call,
which may result in use-after-free.

Fixes: bc3cf17b575a ("ASoC: samsung: odroid: Add support for secondary CPU DAI")
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/1562989575-33785-2-git-send-email-wen.yang99@zte.com.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/samsung/odroid.c b/sound/soc/samsung/odroid.c
index dfb6e46..64ebe89 100644 (file)
--- a/sound/soc/samsung/odroid.c
+++ b/sound/soc/samsung/odroid.c
@@ -284,9 +284,8 @@ static int odroid_audio_probe(struct platform_device *pdev)
        }
 
        of_node_put(cpu);
-       of_node_put(codec);
        if (ret < 0)
-               return ret;
+               goto err_put_node;
 
        ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
        if (ret < 0)
@@ -317,6 +316,7 @@ static int odroid_audio_probe(struct platform_device *pdev)
                goto err_put_clk_i2s;
        }
 
+       of_node_put(codec);
        return 0;
 
 err_put_clk_i2s:
@@ -326,6 +326,8 @@ err_put_sclk:
 err_put_cpu_dai:
        of_node_put(cpu_dai);
        snd_soc_of_put_dai_link_codecs(codec_link);
+err_put_node:
+       of_node_put(codec);
        return ret;
 }