CVE-2023-54098

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/i915/gvt: fix gvt debugfs destroy<br /> <br /> When gvt debug fs is destroyed, need to have a sane check if drm<br /> minor&amp;#39;s debugfs root is still available or not, otherwise in case like<br /> device remove through unbinding, drm minor&amp;#39;s debugfs directory has<br /> already been removed, then intel_gvt_debugfs_clean() would act upon<br /> dangling pointer like below oops.<br /> <br /> i915 0000:00:02.0: Direct firmware load for i915/gvt/vid_0x8086_did_0x1926_rid_0x0a.golden_hw_state failed with error -2<br /> i915 0000:00:02.0: MDEV: Registered<br /> Console: switching to colour dummy device 80x25<br /> i915 0000:00:02.0: MDEV: Unregistering<br /> BUG: kernel NULL pointer dereference, address: 00000000000000a0<br /> PGD 0 P4D 0<br /> Oops: 0002 [#1] PREEMPT SMP PTI<br /> CPU: 2 PID: 2486 Comm: gfx-unbind.sh Tainted: G I 6.1.0-rc8+ #15<br /> Hardware name: Dell Inc. XPS 13 9350/0JXC1H, BIOS 1.13.0 02/10/2020<br /> RIP: 0010:down_write+0x1f/0x90<br /> Code: 1d ff ff 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 53 48 89 fb e8 62 c0 ff ff bf 01 00 00 00 e8 28 5e 31 ff 31 c0 ba 01 00 00 00 48 0f b1 13 75 33 65 48 8b 04 25 c0 bd 01 00 48 89 43 08 bf 01<br /> RSP: 0018:ffff9eb3036ffcc8 EFLAGS: 00010246<br /> RAX: 0000000000000000 RBX: 00000000000000a0 RCX: ffffff8100000000<br /> RDX: 0000000000000001 RSI: 0000000000000064 RDI: ffffffffa48787a8<br /> RBP: ffff9eb3036ffd30 R08: ffffeb1fc45a0608 R09: ffffeb1fc45a05c0<br /> R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000<br /> R13: ffff91acc33fa328 R14: ffff91acc033f080 R15: ffff91acced533e0<br /> FS: 00007f6947bba740(0000) GS:ffff91ae36d00000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00000000000000a0 CR3: 00000001133a2002 CR4: 00000000003706e0<br /> Call Trace:<br /> <br /> simple_recursive_removal+0x9f/0x2a0<br /> ? start_creating.part.0+0x120/0x120<br /> ? _raw_spin_lock+0x13/0x40<br /> debugfs_remove+0x40/0x60<br /> intel_gvt_debugfs_clean+0x15/0x30 [kvmgt]<br /> intel_gvt_clean_device+0x49/0xe0 [kvmgt]<br /> intel_gvt_driver_remove+0x2f/0xb0<br /> i915_driver_remove+0xa4/0xf0<br /> i915_pci_remove+0x1a/0x30<br /> pci_device_remove+0x33/0xa0<br /> device_release_driver_internal+0x1b2/0x230<br /> unbind_store+0xe0/0x110<br /> kernfs_fop_write_iter+0x11b/0x1f0<br /> vfs_write+0x203/0x3d0<br /> ksys_write+0x63/0xe0<br /> do_syscall_64+0x37/0x90<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> RIP: 0033:0x7f6947cb5190<br /> Code: 40 00 48 8b 15 71 9c 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d 51 24 0e 00 00 74 17 b8 01 00 00 00 0f 05 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89<br /> RSP: 002b:00007ffcbac45a28 EFLAGS: 00000202 ORIG_RAX: 0000000000000001<br /> RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007f6947cb5190<br /> RDX: 000000000000000d RSI: 0000555e35c866a0 RDI: 0000000000000001<br /> RBP: 0000555e35c866a0 R08: 0000000000000002 R09: 0000555e358cb97c<br /> R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001<br /> R13: 000000000000000d R14: 0000000000000000 R15: 0000555e358cb8e0<br /> <br /> Modules linked in: kvmgt<br /> CR2: 00000000000000a0<br /> ---[ end trace 0000000000000000 ]---