diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2023-06-22 00:36:12 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2023-06-23 20:28:01 +0300 |
| commit | 5557b62634abbd55bab7b154ce4bca348ad7f96f (patch) | |
| tree | 238b913ad2be04a824d3cf9ce19541d74c90f30f /drivers/pci/pci-acpi.c | |
| parent | 9e30fd26f43b89cb6b4e850a86caa2e50dedb454 (diff) | |
| download | linux-5557b62634abbd55bab7b154ce4bca348ad7f96f.tar.xz | |
PCI/ACPI: Validate acpi_pci_set_power_state() parameter
Previously acpi_pci_set_power_state() assumed the requested power state was
valid (PCI_D0 ... PCI_D3cold). If a caller supplied something else, we
could index outside the state_conv[] array and pass junk to
acpi_device_set_power().
Validate the pci_power_t parameter and return -EINVAL if it's invalid.
Link: https://lore.kernel.org/r/20230621222857.GA122930@bhelgaas
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 052a611081ec..bf545f719182 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1053,32 +1053,37 @@ int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) [PCI_D3hot] = ACPI_STATE_D3_HOT, [PCI_D3cold] = ACPI_STATE_D3_COLD, }; - int error = -EINVAL; + int error; /* If the ACPI device has _EJ0, ignore the device */ if (!adev || acpi_has_method(adev->handle, "_EJ0")) return -ENODEV; switch (state) { - case PCI_D3cold: - if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == - PM_QOS_FLAGS_ALL) { - error = -EBUSY; - break; - } - fallthrough; case PCI_D0: case PCI_D1: case PCI_D2: case PCI_D3hot: - error = acpi_device_set_power(adev, state_conv[state]); + case PCI_D3cold: + break; + default: + return -EINVAL; + } + + if (state == PCI_D3cold) { + if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == + PM_QOS_FLAGS_ALL) + return -EBUSY; } - if (!error) - pci_dbg(dev, "power state changed by ACPI to %s\n", - acpi_power_state_string(adev->power.state)); + error = acpi_device_set_power(adev, state_conv[state]); + if (error) + return error; + + pci_dbg(dev, "power state changed by ACPI to %s\n", + acpi_power_state_string(adev->power.state)); - return error; + return 0; } pci_power_t acpi_pci_get_power_state(struct pci_dev *dev) |