linux-kernel - [PATCH 5.15 47/83] ASoC: imx-card: Fix refcount issue with of_node

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Message-Id: <20221003070723.175841129@linuxfoundation.org>
Date:   Mon,  3 Oct 2022 09:11:12 +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, Shengjiu Wang <shengjiu.wang@....com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 47/83] ASoC: imx-card: Fix refcount issue with of_node_put

From: Shengjiu Wang <shengjiu.wang@....com>

[ Upstream commit d56ba9a04d7548d4149c46ec86a0e3cc41a70f4a ]

imx_card_parse_of will search all the node with loop,
if there is defer probe happen in the middle of loop,
the previous released codec node will be released
twice, then cause refcount issue.

Here assign NULL to pointer of released nodes to fix
the issue.

Fixes: aa736700f42f ("ASoC: imx-card: Add imx-card machine driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
Link: https://lore.kernel.org/r/1663059601-29259-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/fsl/imx-card.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/fsl/imx-card.c b/sound/soc/fsl/imx-card.c
index 593d69b96523..d59f5efbf7ed 100644
--- a/sound/soc/fsl/imx-card.c
+++ b/sound/soc/fsl/imx-card.c
@@ -698,6 +698,10 @@ static int imx_card_parse_of(struct imx_card_data *data)
 		of_node_put(cpu);
 		of_node_put(codec);
 		of_node_put(platform);
+
+		cpu = NULL;
+		codec = NULL;
+		platform = NULL;
 	}
 
 	return 0;
-- 
2.35.1