linux-kernel - [PATCH 4.9 022/139] media: platform: fcp: Fix a reference count leak.

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Message-Id: <20201027134903.186342579@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:48:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qiushi Wu <wu000273@....edu>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 022/139] media: platform: fcp: Fix a reference count leak.

From: Qiushi Wu <wu000273@....edu>

[ Upstream commit 63e36a381d92a9cded97e90d481ee22566557dd1 ]

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code, causing incorrect ref count if
pm_runtime_put_noidle() is not called in error handling paths.
Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails.

Fixes: 6eaafbdb668b ("[media] v4l: rcar-fcp: Keep the coding style consistent")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/rcar-fcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rcar-fcp.c b/drivers/media/platform/rcar-fcp.c
index 8e9c3bd36d03e..5b5722e65e9b9 100644
--- a/drivers/media/platform/rcar-fcp.c
+++ b/drivers/media/platform/rcar-fcp.c
@@ -107,8 +107,10 @@ int rcar_fcp_enable(struct rcar_fcp_device *fcp)
 		return 0;
 
 	ret = pm_runtime_get_sync(fcp->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(fcp->dev);
 		return ret;
+	}
 
 	return 0;
 }
-- 
2.25.1