* Re: [PATCH] iommu/vt-d: Fix oops due to out of scope access
[not found] <20260421031347.1408890-1-zhenzhong.duan@intel.com>
@ 2026-05-08 7:58 ` Baolu Lu
0 siblings, 0 replies; only message in thread
From: Baolu Lu @ 2026-05-08 7:58 UTC (permalink / raw)
To: Zhenzhong Duan, iommu, linux-kernel
Cc: dwmw2, joro, will, robin.murphy, kevin.tian, Jacob Pan,
Joerg Roedel
On 4/21/26 11:13, Zhenzhong Duan wrote:
> Below oops triggers when kill QEMU process:
>
> Oops: general protection fault, probably for non-canonical address 0x7fffffff844eaaa7: 0000 [#1] SMP NOPTI
> Call Trace:
> <TASK>
> do_raw_spin_lock+0xaa/0xc0
> _raw_spin_lock_irqsave+0x21/0x40
> domain_remove_dev_pasid+0x52/0x160
> intel_nested_set_dev_pasid+0x1b9/0x1e0
> __iommu_set_group_pasid+0x56/0x120
> pci_dev_reset_iommu_done+0xe3/0x180
> pcie_flr+0x65/0x160
> __pci_reset_function_locked+0x5b/0x120
> vfio_pci_core_close_device+0x63/0xe0 [vfio_pci_core]
> vfio_df_close+0x4f/0xa0
> vfio_df_unbind_iommufd+0x2d/0x60
> vfio_device_fops_release+0x3e/0x40
> __fput+0xe5/0x2c0
> task_work_run+0x58/0xa0
> do_exit+0x2c8/0x600
> do_group_exit+0x2f/0xa0
> get_signal+0x863/0x8c0
> arch_do_signal_or_restart+0x24/0x100
> exit_to_user_mode_loop+0x87/0x380
> do_syscall_64+0x2ff/0x11e0
> entry_SYSCALL_64_after_hwframe+0x76/0x7e
>
> The global static blocked domain is a dummy domain without corresponding
> dmar_domain structure, accessing beyond iommu_domain structure triggers
> oops easily. Fix it by return early in domain_remove_dev_pasid() like
> identity domain.
>
> Fixes: 7d0c9da6c150 ("iommu/vt-d: Add set_dev_pasid callback for dma domain")
> Signed-off-by: Zhenzhong Duan<zhenzhong.duan@intel.com>
> ---
> drivers/iommu/intel/iommu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Queued for v7.1-rc. Thanks!
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