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From:   wu000273@umn.edu
To:     kjlu@umn.edu
Cc:     wu000273@umn.edu, Kyungmin Park <kyungmin.park@samsung.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] media: exynos4-is: Fix a reference count leak due to pm_runtime_get_sync
Date:   Sat, 13 Jun 2020 22:10:58 -0500
Message-Id: <20200614031058.30161-1-wu000273@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Qiushi Wu <wu000273@umn.edu>

On calling pm_runtime_get_sync() the reference count of the device
is incremented. In case of failure, decrement the
reference count before returning the error.

Signed-off-by: Qiushi Wu <wu000273@umn.edu>
---
 drivers/media/platform/exynos4-is/media-dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 9aaf3b8060d5..cfb6891180b0 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -484,8 +484,10 @@ static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 		return -ENXIO;
 
 	ret = pm_runtime_get_sync(fmd->pmf);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put(fmd->pmf);
 		return ret;
+	}
 
 	fmd->num_sensors = 0;
 
-- 
2.17.1