From: Rob Clark robdclark@chromium.org

stable inclusion from stable-v5.10.164 commit 68bcd063857075d2f9edfed6024387ac377923e2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IALIA1 CVE: CVE-2022-48899

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 52531258318ed59a2dc5a43df2eaf0eb1d65438e ]

Userspace can guess the handle value and try to race GEM object creation with handle close, resulting in a use-after-free if we dereference the object after dropping the handle's reference. For that reason, dropping the handle's reference must be done *after* we are done dereferencing the object.

Signed-off-by: Rob Clark robdclark@chromium.org Reviewed-by: Chia-I Wu olvaffe@gmail.com Fixes: 62fb7a5e1096 ("virtio-gpu: add 3d/virgl support") Cc: stable@vger.kernel.org Signed-off-by: Dmitry Osipenko dmitry.osipenko@collabora.com Link: https://patchwork.freedesktop.org/patch/msgid/20221216233355.542197-2-robdcl... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zeng Heng zengheng4@huawei.com --- drivers/gpu/drm/virtio/virtgpu_ioctl.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c index 33b8ebab178a..36efa273155d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -279,10 +279,18 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data, drm_gem_object_release(obj); return ret; } - drm_gem_object_put(obj);

rc->res_handle = qobj->hw_res_handle; /* similiar to a VM address */ rc->bo_handle = handle; + + /* + * The handle owns the reference now. But we must drop our + * remaining reference *after* we no longer need to dereference + * the obj. Otherwise userspace could guess the handle and + * race closing it from another thread. + */ + drm_gem_object_put(obj); + return 0; }