linux-kernel - [PATCH 4.14 121/165] ASoC: hdmi-codec: Fix module unloading caused kernel crash

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Date:   Thu, 24 May 2018 11:38:47 +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, Peter Ujfalusi <peter.ujfalusi@...com>,
        Jyri Sarha <jsarha@...com>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 121/165] ASoC: hdmi-codec: Fix module unloading caused kernel crash

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

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

From: Peter Ujfalusi <peter.ujfalusi@...com>

[ Upstream commit 5e558f8afaec8957932b1dbe5aeff800f9fc6957 ]

The hcp->chmap_info must not be freed up in the hdmi_codec_remove()
function as it leads to kernel crash due ALSA core's
pcm_chmap_ctl_private_free() is trying to free it up again when the card
destroyed via snd_card_free.

Commit cd6111b26280a ("ASoC: hdmi-codec: add channel mapping control")
should not have added the kfree(hcp->chmap_info); to the hdmi_codec_remove
function.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Reviewed-by: Jyri Sarha <jsarha@...com>
Tested-by: Jyri Sarha <jsarha@...com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/codecs/hdmi-codec.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -801,12 +801,7 @@ static int hdmi_codec_probe(struct platf
 
 static int hdmi_codec_remove(struct platform_device *pdev)
 {
-	struct device *dev = &pdev->dev;
-	struct hdmi_codec_priv *hcp;
-
-	hcp = dev_get_drvdata(dev);
-	kfree(hcp->chmap_info);
-	snd_soc_unregister_codec(dev);
+	snd_soc_unregister_codec(&pdev->dev);
 
 	return 0;
 }