linux-kernel - [PATCH] vdpa: fix use-after-free on vp_vdpa

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Date:   Tue,  1 Mar 2022 17:10:59 +0800
From:   Yi Wang <wang.yi59@....com.cn>
To:     mst@...hat.com
Cc:     jasowang@...hat.com, elic@...dia.com, xieyongji@...edance.com,
        sgarzare@...hat.com, wuzongyong@...ux.alibaba.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, xue.zhihong@....com.cn,
        wang.yi59@....com.cn, wang.liang82@....com.cn,
        Zhang Min <zhang.min9@....com.cn>
Subject: [PATCH] vdpa: fix use-after-free on vp_vdpa_remove

From: Zhang Min <zhang.min9@....com.cn>

When vp_vdpa driver is unbind, vp_vdpa is freed in vdpa_unregister_device
and then vp_vdpa->mdev.pci_dev is dereferenced in vp_modern_remove,
triggering use-after-free.

Call Trace of unbinding driver free vp_vdpa :
do_syscall_64
  vfs_write
    kernfs_fop_write_iter
      device_release_driver_internal
        pci_device_remove
          vp_vdpa_remove
            vdpa_unregister_device
              kobject_release
                device_release
                  kfree

Call Trace of dereference vp_vdpa->mdev.pci_dev:
vp_modern_remove
  pci_release_selected_regions
    pci_release_region
      pci_resource_len
        pci_resource_end
          (dev)->resource[(bar)].end

Signed-off-by: Zhang Min <zhang.min9@....com.cn>
Signed-off-by: Yi Wang <wang.yi59@....com.cn>
---
 drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index a57e381e830b..cce101e6a940 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -533,8 +533,8 @@ static void vp_vdpa_remove(struct pci_dev *pdev)
 {
 	struct vp_vdpa *vp_vdpa = pci_get_drvdata(pdev);
 
-	vdpa_unregister_device(&vp_vdpa->vdpa);
 	vp_modern_remove(&vp_vdpa->mdev);
+	vdpa_unregister_device(&vp_vdpa->vdpa);
 }
 
 static struct pci_driver vp_vdpa_driver = {
-- 
2.27.0