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SubjectRe: [PATCH] ACPI / PCI: Fix NULL pointer dereference in acpi_get_pci_dev() (rev. 2)
* Rafael J. Wysocki <>:
> From: Rafael J. Wysocki <>
> acpi_get_pci_dev() may be called for a non-PCI device, in which case
> it should return NULL. However, it assumes that every handle it
> finds in the ACPI CA name space, between given device handle and the
> PCI root bridge handle, corresponds to a PCI-to-PCI bridge with an
> existing secondary bus. For this reason, when it finds a struct
> pci_dev object corresponding to one of them, it doesn't check if
> its 'subordinate' field is a valid pointer. This obviously leads to
> a NULL pointer dereference if acpi_get_pci_dev() is called for a
> non-PCI device with a PCI parent which is not a bridge.
> To fix this issue make acpi_get_pci_dev() check if pdev->subordinate
> is not NULL for every device it finds on the path between the root
> bridge and the device it's supposed to get to and return NULL if the
> "target" device cannot be found.
> Fixes, which is a
> regression from 2.6.30.

Acked-by: Alex Chiang <>

> Signed-off-by: Rafael J. Wysocki <>
> ---
> Jesse, Len,
> This is a replacement for the original $subject patch (now in the Len's tree
> as commit 5988eaded02e3cca2702f46efc255143468255bd).
> The code was correct, but the comment and the changelog were not. Please
> use the one below instead.
> Thanks,
> Rafael

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