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ACPI fix for 5.15-rc5

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Fix a recent ACPI-related regression in the PCI subsystem that
 introduced a NULL pointer dereference possible to trigger from
 user space via sysfs on some systems.
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Merge tag 'acpi-5.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fix from Rafael Wysocki:
 "Fix a recent ACPI-related regression in the PCI subsystem that
  introduced a NULL pointer dereference possible to trigger from
  user space via sysfs on some systems"

* tag 'acpi-5.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PCI: ACPI: Check parent pointer in acpi_pci_find_companion()
This commit is contained in:
Linus Torvalds 2021-10-08 11:49:30 -07:00
commit cdc726fb35
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/pci-acpi.c
View file

@ -1249,6 +1249,9 @@ static struct acpi_device *acpi_pci_find_companion(struct device *dev)
bool check_children;
u64 addr;
if (!dev->parent)
return NULL;
down_read(&pci_acpi_companion_lookup_sem);
adev = pci_acpi_find_companion_hook ?