On Mon, Mar 24, 2025 at 05:01:08PM +0800, Bo Sun wrote:
> The previous implementation of of_pci_add_properties() and
> of_pci_prop_bus_range() assumed that a valid secondary bus is always
> present, which can be problematic in cases where no bus numbers are
> assigned for a secondary bus. This patch introduces a check for a valid
> secondary bus and omits the 'bus-range' property if it is not available,
> preventing dereferencing the NULL pointer.
>
> Cc: stable@vger.kernel.org
> Fixes: 407d1a51921e ("PCI: Create device tree node for bridge")
> Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
> Signed-off-by: Bo Sun <Bo.Sun.CN@windriver.com>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
- Mani
> ---
> v3: Add 'Fixes' tag as requested by Mani.
>
> drivers/pci/of_property.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c
> index 58fbafac7c6a..792b0163af45 100644
> --- a/drivers/pci/of_property.c
> +++ b/drivers/pci/of_property.c
> @@ -91,6 +91,9 @@ static int of_pci_prop_bus_range(struct pci_dev *pdev,
> struct of_changeset *ocs,
> struct device_node *np)
> {
> + if (!pdev->subordinate)
> + return -EINVAL;
> +
> u32 bus_range[] = { pdev->subordinate->busn_res.start,
> pdev->subordinate->busn_res.end };
>
> --
> 2.49.0
>
--
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