Bug 2405742 (CVE-2022-50576)

Summary: CVE-2022-50576 kernel: serial: pch: Fix PCI device refcount leak in pch_request_dma()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-22 14:03:44 UTC 
In the Linux kernel, the following vulnerability has been resolved:

serial: pch: Fix PCI device refcount leak in pch_request_dma()

As comment of pci_get_slot() says, it returns a pci_device with its
refcount increased. The caller must decrement the reference count by
calling pci_dev_put().

Since 'dma_dev' is only used to filter the channel in filter(), we can
call pci_dev_put() before exiting from pch_request_dma(). Add the
missing pci_dev_put() for the normal and error path.
Comment 1 Jon Moroney 2025-10-22 17:23:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102209-CVE-2022-50576-98f3@gregkh/T