vdpa: fix use-after-free on vp_vdpa_remove

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: vdpa: fix use-after-free on vp_vdpa_remove 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

References

• https://git.kernel.org/stable/c/4b1743bc715a3691a63ac21b349079b07bf1b19e
• https://git.kernel.org/stable/c/dc54ba9932aeaaa1a21fe214af1f446593a78274
• https://git.kernel.org/stable/c/eb057b44dbe35ae14527830236a92f51de8f9184