On 11/12/2024 3:03 PM, Manivannan Sadhasivam wrote:
> On Thu, Nov 07, 2024 at 08:53:08AM +0800, Zijun Hu wrote:
>> From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
>>
>> pci_epc_destroy() invokes pci_bus_release_domain_nr() to release domain_nr
>> ID, but the invocation has below 2 faults:
>>
>> - The later accesses device @epc->dev which has been kfree()ed by previous
>> device_unregister(), namely, it is a UAF issue.
>>
>> - The later frees the domain_nr ID into @epc->dev, but the ID is actually
>> allocated from @epc->dev.parent, so it will destroy domain_nr IDA.
>>
>> Fix by freeing the ID to @epc->dev.parent before unregistering @epc->dev.
>>
>> The file(s) affected are shown below since they indirectly use the API.
>> drivers/pci/controller/cadence/pcie-cadence-ep.c
>> drivers/pci/controller/dwc/pcie-designware-ep.c
>> drivers/pci/controller/pcie-rockchip-ep.c
>> drivers/pci/controller/pcie-rcar-ep.c
>
> No need to mention the callers.
>
thank you Manivannan for code review.
good suggestions, i will take them for further similar patches.(^^)
>>
>> Fixes: 0328947c5032 ("PCI: endpoint: Assign PCI domain number for endpoint controllers")
>> Cc: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
>> Cc: Jingoo Han <jingoohan1@xxxxxxxxx>
>> Cc: Marek Vasut <marek.vasut+renesas@xxxxxxxxx>
>> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
>> Cc: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>> Cc: Heiko Stuebner <heiko@xxxxxxxxx>
>> Cc: stable@xxxxxxxxxxxxxxx
>> Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
>
> Good catch! (not sure how I messed up in first place).
>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
>
> - Mani
>
>> ---
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>>
>
