linux-kernel - [PATCH 1/3] drm/virtio: Fixes a potential NULL pointer dereference on probe failure

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Message-Id: <20210517084913.403-1-xieyongji@bytedance.com>
Date:   Mon, 17 May 2021 16:49:11 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     airlied@...ux.ie, kraxel@...hat.com, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] drm/virtio: Fixes a potential NULL pointer dereference on probe failure

The dev->dev_private might not be allocated if virtio_gpu_pci_quirk()
or virtio_gpu_init() failed. In this case, we should avoid the cleanup
in virtio_gpu_release().

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/gpu/drm/virtio/virtgpu_kms.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index b375394193be..aa532ad31a23 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -264,6 +264,9 @@ void virtio_gpu_release(struct drm_device *dev)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 
+	if (!vgdev)
+		return;
+
 	virtio_gpu_modeset_fini(vgdev);
 	virtio_gpu_free_vbufs(vgdev);
 	virtio_gpu_cleanup_cap_cache(vgdev);
-- 
2.11.0