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From:   Navid Emamdoost <navid.emamdoost@gmail.com>
To:     Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Hawking Zhang <Hawking.Zhang@amd.com>,
        Evan Quan <evan.quan@amd.com>, Feifei Xu <Feifei.Xu@amd.com>,
        "Tianci.Yin" <tianci.yin@amd.com>,
        =?UTF-8?q?Marek=20Ol=C5=A1=C3=A1k?= <marek.olsak@amd.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Andrey Grodzovsky <andrey.grodzovsky@amd.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org
Cc:     emamd001@umn.edu, wu000273@umn.edu, kjlu@umn.edu, smccaman@umn.edu,
        Navid Emamdoost <navid.emamdoost@gmail.com>
Subject: [PATCH] drm/amd/display: fix ref count leak in amdgpu_drm_ioctl
Date:   Sun, 14 Jun 2020 02:14:50 -0500
Message-Id: <20200614071452.83725-1-navid.emamdoost@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

in amdgpu_drm_ioctl the call to pm_runtime_get_sync increments the
counter even in case of failure, leading to incorrect
ref count. In case of failure, decrement the ref count before returning.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 126e74758a34..d73924e35a57 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1373,11 +1373,12 @@ long amdgpu_drm_ioctl(struct file *filp,
 	dev = file_priv->minor->dev;
 	ret = pm_runtime_get_sync(dev->dev);
 	if (ret < 0)
-		return ret;
+		goto out;
 
 	ret = drm_ioctl(filp, cmd, arg);
 
 	pm_runtime_mark_last_busy(dev->dev);
+out:
 	pm_runtime_put_autosuspend(dev->dev);
 	return ret;
 }
-- 
2.17.1