linux-kernel - [PATCH AUTOSEL 4.19 06/11] crypto: stm32 - fix reference leak in stm32_crc

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Message-Id: <20220407011609.115258-6-sashal@kernel.org>
Date:   Wed,  6 Apr 2022 21:16:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zheng Yongjun <zhengyongjun3@...wei.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com,
        linux-crypto@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 06/11] crypto: stm32 - fix reference leak in stm32_crc_remove

From: Zheng Yongjun <zhengyongjun3@...wei.com>

[ Upstream commit e9a36feecee0ee5845f2e0656f50f9942dd0bed3 ]

pm_runtime_get_sync() will increment pm usage counter even it
failed. Forgetting to call pm_runtime_put_noidle will result
in reference leak in stm32_crc_remove, so we should fix it.

Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/stm32/stm32_crc32.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
index 6848f34a9e66..de645bf84980 100644
--- a/drivers/crypto/stm32/stm32_crc32.c
+++ b/drivers/crypto/stm32/stm32_crc32.c
@@ -334,8 +334,10 @@ static int stm32_crc_remove(struct platform_device *pdev)
 	struct stm32_crc *crc = platform_get_drvdata(pdev);
 	int ret = pm_runtime_get_sync(crc->dev);
 
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(crc->dev);
 		return ret;
+	}
 
 	spin_lock(&crc_list.lock);
 	list_del(&crc->list);
-- 
2.35.1