Re: [PATCH] iommu/amd: Fix undefined behavior in devid_write debugfs function

[Will Deacon]

On Mon, 01 Jun 2026 08:12:40 -0400, lirongqing wrote:
> When for_each_pci_segment() loop completes without finding a matching
> segment, the pci_seg pointer is not NULL but points to an invalid memory
> location (the list head). Accessing pci_seg->id after the loop causes
> undefined behavior.
> 
> Fix this by handling the successful case inside the loop and returning
> -EINVAL after the loop if no matching segment is found.
> 
> [...]

Applied to iommu (amd/amd-vi), thanks!

[1/1] iommu/amd: Fix undefined behavior in devid_write debugfs function
      https://git.kernel.org/iommu/c/843e14998966

Cheers,
-- 
Will

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