x86/amd_node: Fix PCI device reference counting in amd_smn_init()

In the Linux kernel, the following vulnerability has been resolved: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL.

Source published

25 Sep 2026 10:22:56 UTC

Source modified

19 Oct 2026 09:11:12 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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