linux-kernel - [PATCH 4.9 23/43] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac

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Message-Id: <20210824170614.710813-24-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 13:05:54 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yu Kuai <yukuai3@...wei.com>, Hulk Robot <hulkci@...wei.com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 23/43] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe()

From: Yu Kuai <yukuai3@...wei.com>

[ Upstream commit 1da569fa7ec8cb0591c74aa3050d4ea1397778b4 ]

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by moving the error_pm label above the pm_runtime_put() in
the error path.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
Link: https://lore.kernel.org/r/20210706124521.1371901-1-yukuai3@huawei.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/sh/usb-dmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/sh/usb-dmac.c b/drivers/dma/sh/usb-dmac.c
index 6682b3eec2b6..ec15ded640f6 100644
--- a/drivers/dma/sh/usb-dmac.c
+++ b/drivers/dma/sh/usb-dmac.c
@@ -861,8 +861,8 @@ static int usb_dmac_probe(struct platform_device *pdev)
 
 error:
 	of_dma_controller_free(pdev->dev.of_node);
-	pm_runtime_put(&pdev->dev);
 error_pm:
+	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	return ret;
 }
-- 
2.30.2