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;
From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Aditya Pakki <pakki001@umn.edu>, Ben Skeggs <bskeggs@redhat.com>,
        Sasha Levin <sashal@kernel.org>,
        dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org
Subject: [PATCH AUTOSEL 5.8 48/62] drm/nouveau/drm/noveau: fix reference count leak in nouveau_fbcon_open
Date:   Fri, 21 Aug 2020 12:14:09 -0400
Message-Id: <20200821161423.347071-48-sashal@kernel.org>
In-Reply-To: <20200821161423.347071-1-sashal@kernel.org>
References: <20200821161423.347071-1-sashal@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Aditya Pakki <pakki001@umn.edu>

[ Upstream commit bfad51c7633325b5d4b32444efe04329d53297b2 ]

nouveau_fbcon_open() calls calls pm_runtime_get_sync() that
increments the reference count. In case of failure, decrement the
ref count before returning the error.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/nouveau/nouveau_fbcon.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index d5c23d1c20d88..44e515bbbb444 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -189,8 +189,10 @@ nouveau_fbcon_open(struct fb_info *info, int user)
 	struct nouveau_fbdev *fbcon = info->par;
 	struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
 	int ret = pm_runtime_get_sync(drm->dev->dev);
-	if (ret < 0 && ret != -EACCES)
+	if (ret < 0 && ret != -EACCES) {
+		pm_runtime_put(drm->dev->dev);
 		return ret;
+	}
 	return 0;
 }
 
-- 
2.25.1