linux-kernel - [PATCH 5.15 511/846] drm/vmwgfx: Release ttm memory if probe fails

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Date:   Mon, 24 Jan 2022 19:40:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zack Rusin <zackr@...are.com>,
        Martin Krastev <krastevm@...are.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 511/846] drm/vmwgfx: Release ttm memory if probe fails

From: Zack Rusin <zackr@...are.com>

[ Upstream commit 28b5f3b6121b7db2a44be499cfca0b6b801588b6 ]

The ttm mem global state was leaking if the vmwgfx driver load failed.

In case of a driver load failure we have to make sure we also release
the ttm mem global state.

Signed-off-by: Zack Rusin <zackr@...are.com>
Reviewed-by: Martin Krastev <krastevm@...are.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211105193845.258816-3-zackr@vmware.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index ab9a1750e1dff..8d0b083ba267f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1617,34 +1617,40 @@ static int vmw_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
 	if (ret)
-		return ret;
+		goto out_error;
 
 	ret = pcim_enable_device(pdev);
 	if (ret)
-		return ret;
+		goto out_error;
 
 	vmw = devm_drm_dev_alloc(&pdev->dev, &driver,
 				 struct vmw_private, drm);
-	if (IS_ERR(vmw))
-		return PTR_ERR(vmw);
+	if (IS_ERR(vmw)) {
+		ret = PTR_ERR(vmw);
+		goto out_error;
+	}
 
 	pci_set_drvdata(pdev, &vmw->drm);
 
 	ret = ttm_mem_global_init(&ttm_mem_glob, &pdev->dev);
 	if (ret)
-		return ret;
+		goto out_error;
 
 	ret = vmw_driver_load(vmw, ent->device);
 	if (ret)
-		return ret;
+		goto out_release;
 
 	ret = drm_dev_register(&vmw->drm, 0);
-	if (ret) {
-		vmw_driver_unload(&vmw->drm);
-		return ret;
-	}
+	if (ret)
+		goto out_unload;
 
 	return 0;
+out_unload:
+	vmw_driver_unload(&vmw->drm);
+out_release:
+	ttm_mem_global_release(&ttm_mem_glob);
+out_error:
+	return ret;
 }
 
 static int __init vmwgfx_init(void)
-- 
2.34.1