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This CVE has been marked Rejected in the CVE List. These CVEs are stored in the NVD, but do not show up in search results by default.
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
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In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: fix slab-use-after-free in amdgpu_userq_mgr_fini+0x70c
The issue was reproduced on NV10 using IGT pci_unplug test.
It is expected that `amdgpu_driver_postclose_kms()` is called prior to `amdgpu_drm_release()`.
However, the bug is that `amdgpu_fpriv` was freed in `amdgpu_driver_postclose_kms()`, and then
later accessed in `amdgpu_drm_release()` via a call to `amdgpu_userq_mgr_fini()`.
As a result, KASAN detected a use-after-free condition, as shown in the log below.
The proposed fix is to move the calls to `amdgpu_eviction_fence_destroy()` and
`amdgpu_userq_mgr_fini()` into `amdgpu_driver_postclose_kms()`, so they are invoked before
`amdgpu_fpriv` is freed.
This also ensures symmetry with the initialization path in `amdgpu_driver_open_kms()`,
where the following components are initialized:
- `amdgpu_userq_mgr_init()`
- `amdgpu_eviction_fence_init()`
- `amdgpu_ctx_mgr_init()`
Correspondingly, in `amdgpu_driver_postclose_kms()` we should clean up using:
- `amdgpu_userq_mgr_fini()`
- `amdgpu_eviction_fence_destroy()`
- `amdgpu_ctx_mgr_fini()`
This change eliminates the use-after-free and improves consistency in resource management between open and close paths.
[ +0.094367] ==================================================================
[ +0.000026] BUG: KASAN: slab-use-after-free in amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000866] Write of size 8 at addr ffff88811c068c60 by task amd_pci_unplug/1737
[ +0.000026] CPU: 3 UID: 0 PID: 1737 Comm: amd_pci_unplug Not tainted 6.14.0+ #2
[ +0.000008] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020
[ +0.000004] Call Trace:
[ +0.000004] <TASK>
[ +0.000003] dump_stack_lvl+0x76/0xa0
[ +0.000010] print_report+0xce/0x600
[ +0.000009] ? amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000790] ? srso_return_thunk+0x5/0x5f
[ +0.000007] ? kasan_complete_mode_report_info+0x76/0x200
[ +0.000008] ? amdgpu_userq_mgr_fini+0x70c/0x730
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: fix slab-use-after-free in amdgpu_userq_mgr_fini+0x70c
The issue was reproduced on NV10 using IGT pci_unplug test.
It is expected that `amdgpu_driver_postclose_kms()` is called prior to `amdgpu_drm_release()`.
However, the bug is that `amdgpu_fpriv` was freed in `amdgpu_driver_postclose_kms()`, and then
later accessed in `amdgpu_drm_release()` via a call to `amdgpu_userq_mgr_fini()`.
As a result, KASAN detected a use-after-free condition, as shown in the log below.
The proposed fix is to move the calls to `amdgpu_eviction_fence_destroy()` and
`amdgpu_userq_mgr_fini()` into `amdgpu_driver_postclose_kms()`, so they are invoked before
`amdgpu_fpriv` is freed.
This also ensures symmetry with the initialization path in `amdgpu_driver_open_kms()`,
where the following components are initialized:
- `amdgpu_userq_mgr_init()`
- `amdgpu_eviction_fence_init()`
- `amdgpu_ctx_mgr_init()`
Correspondingly, in `amdgpu_driver_postclose_kms()` we should clean up using:
- `amdgpu_userq_mgr_fini()`
- `amdgpu_eviction_fence_destroy()`
- `amdgpu_ctx_mgr_fini()`
This change eliminates the use-after-free and improves consistency in resource management between open and close paths.
[ +0.094367] ==================================================================
[ +0.000026] BUG: KASAN: slab-use-after-free in amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000866] Write of size 8 at addr ffff88811c068c60 by task amd_pci_unplug/1737
[ +0.000026] CPU: 3 UID: 0 PID: 1737 Comm: amd_pci_unplug Not tainted 6.14.0+ #2
[ +0.000008] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020
[ +0.000004] Call Trace:
[ +0.000004] <TASK>
[ +0.000003] dump_stack_lvl+0x76/0xa0
[ +0.000010] print_report+0xce/0x600
[ +0.000009] ? amdgpu_userq_mgr_fini+0x70c/0x730 [amdgpu]
[ +0.000790] ? srso_return_thunk+0x5/0x5f
[ +0.000007] ? kasan_complete_mode_report_info+0x76/0x200
[ +0.000008] ? amdgpu_userq_mgr_fini+0x70c/0x730
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