Bug 2320694 (CVE-2022-49000)

Summary: CVE-2022-49000 kernel: iommu/vt-d: Fix PCI device refcount leak in has_external_pci()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2024-10-21 21:03:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Fix PCI device refcount leak in has_external_pci()

for_each_pci_dev() is implemented by pci_get_device(). The comment of
pci_get_device() says that it will increase the reference count for the
returned pci_dev and also decrease the reference count for the input
pci_dev @from if it is not NULL.

If we break for_each_pci_dev() loop with pdev not NULL, we need to call
pci_dev_put() to decrease the reference count. Add the missing
pci_dev_put() before 'return true' to avoid reference count leak.
Comment 1 Avinash Hanwate 2024-10-22 07:45:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102150-CVE-2022-49000-2c9c@gregkh/T