Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
DMARC-Filter: OpenDMARC Filter v1.3.2 mta-p6.oit.umn.edu 49kzBV5k6Bz9vJyw
From:   wu000273@umn.edu
To:     kjlu@umn.edu
Cc:     wu000273@umn.edu, Hugues Fruchet <hugues.fruchet@st.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        linux-media@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] media: stm32-dcmi: Fix a reference count leak
Date:   Sat, 13 Jun 2020 21:36:59 -0500
Message-Id: <20200614023659.25979-1-wu000273@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Qiushi Wu <wu000273@umn.edu>

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count if pm_runtime_put is not
called in error handling paths. Thus replace the jump target
"err_release_buffers" by "err_pm_putw".

Fixes: 152e0bf60219 ("media: stm32-dcmi: add power saving support")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
---
 drivers/media/platform/stm32/stm32-dcmi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index b8931490b83b..fd1c41cba52f 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -733,7 +733,7 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 	if (ret < 0) {
 		dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
 			__func__, ret);
-		goto err_release_buffers;
+		goto err_pm_put;
 	}
 
 	ret = media_pipeline_start(&dcmi->vdev->entity, &dcmi->pipeline);
@@ -837,8 +837,6 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 
 err_pm_put:
 	pm_runtime_put(dcmi->dev);
-
-err_release_buffers:
 	spin_lock_irq(&dcmi->irqlock);
 	/*
 	 * Return all buffers to vb2 in QUEUED state.
-- 
2.17.1