Sasha Levin
2021-Jul-06 11:16 UTC
[PATCH AUTOSEL 5.12 024/160] drm/virtio: Fixes a potential NULL pointer dereference on probe failure
From: Xie Yongji <xieyongji at bytedance.com>
[ Upstream commit 17f46f488a5d82c5568e6e786cd760bba1c2ee09 ]
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 at bytedance.com>
Link:
http://patchwork.freedesktop.org/patch/msgid/20210517084913.403-1-xieyongji at
bytedance.com
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
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);
--
2.30.2