linux-kernel - [PATCH AUTOSEL 5.4 35/40] usb: dwc3: pci: Fix reference count leak in dwc3_pci_resume

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Message-Id: <20200702012402.2701121-35-sashal@kernel.org>
Date:   Wed,  1 Jul 2020 21:23:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Aditya Pakki <pakki001@....edu>, Felipe Balbi <balbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 35/40] usb: dwc3: pci: Fix reference count leak in dwc3_pci_resume_work

From: Aditya Pakki <pakki001@....edu>

[ Upstream commit 2655971ad4b34e97dd921df16bb0b08db9449df7 ]

dwc3_pci_resume_work() calls pm_runtime_get_sync() that increments
the reference counter. In case of failure, decrement the reference
before returning.

Signed-off-by: Aditya Pakki <pakki001@....edu>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc3/dwc3-pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index b67372737dc9b..96c05b121fac8 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -206,8 +206,10 @@ static void dwc3_pci_resume_work(struct work_struct *work)
 	int ret;
 
 	ret = pm_runtime_get_sync(&dwc3->dev);
-	if (ret)
+	if (ret) {
+		pm_runtime_put_sync_autosuspend(&dwc3->dev);
 		return;
+	}
 
 	pm_runtime_mark_last_busy(&dwc3->dev);
 	pm_runtime_put_sync_autosuspend(&dwc3->dev);
-- 
2.25.1