linux-kernel - [PATCH AUTOSEL 5.9 110/111] drm/panfrost: perfcnt: fix ref count leak in panfrost_perfcnt_enable

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Date:   Sun, 18 Oct 2020 15:18:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Navid Emamdoost <navid.emamdoost@...il.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.9 110/111] drm/panfrost: perfcnt: fix ref count leak in panfrost_perfcnt_enable_locked

From: Navid Emamdoost <navid.emamdoost@...il.com>

[ Upstream commit 9df0e0c1889677175037445d5ad1654d54176369 ]

in panfrost_perfcnt_enable_locked, pm_runtime_get_sync is called which
increments the counter even in case of failure, leading to incorrect
ref count. In case of failure, decrement the ref count before returning.

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200614063619.44944-1-navid.emamdoost@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
index ec4695cf3caf3..fdbc8d9491356 100644
--- a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
+++ b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
@@ -83,11 +83,13 @@ static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
 
 	ret = pm_runtime_get_sync(pfdev->dev);
 	if (ret < 0)
-		return ret;
+		goto err_put_pm;
 
 	bo = drm_gem_shmem_create(pfdev->ddev, perfcnt->bosize);
-	if (IS_ERR(bo))
-		return PTR_ERR(bo);
+	if (IS_ERR(bo)) {
+		ret = PTR_ERR(bo);
+		goto err_put_pm;
+	}
 
 	/* Map the perfcnt buf in the address space attached to file_priv. */
 	ret = panfrost_gem_open(&bo->base, file_priv);
@@ -168,6 +170,8 @@ static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
 	panfrost_gem_close(&bo->base, file_priv);
 err_put_bo:
 	drm_gem_object_put(&bo->base);
+err_put_pm:
+	pm_runtime_put(pfdev->dev);
 	return ret;
 }
 
-- 
2.25.1