linux-kernel - [PATCH] drm/amd/display: fix ref count leak in amdgpu_drm

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Message-Id: <20200614071452.83725-1-navid.emamdoost@gmail.com>
Date:   Sun, 14 Jun 2020 02:14:50 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Evan Quan <evan.quan@....com>, Feifei Xu <Feifei.Xu@....com>,
        "Tianci.Yin" <tianci.yin@....com>,
        Marek Olšák <marek.olsak@....com>,
        Hans de Goede <hdegoede@...hat.com>,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu, smccaman@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] drm/amd/display: fix ref count leak in amdgpu_drm_ioctl

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@...il.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