Re: CVE-2024-42226: usb: xhci: prevent potential failure in handle_tx_event() for Transfer events without TRB

["Neronin, Niklas" <niklas.neronin@linux.intel.com>]

On 06/08/2024 16.53, Jinjiang Tu wrote:
> 
> 在 2024/8/6 19:15, Neronin, Niklas 写道:
>> On 06/08/2024 12.25, Jinjiang Tu wrote:
>>> Hi, Niklas
>>>
>>> The commit 66cb618bf0bb ("usb: xhci: prevent potential failure in handle_tx_event() for Transfer events without TRB")
>>> has been assigned with CVE-2024-42226, but the commit has been reverted in 6.1.99 and 6.6.39 due to
>>> performance regression. Do you have a plan to address this issue, or if this CVE should be rejected?
>>>
>>> Thanks!
>>>
>> Hi,
>>
>> Currently, I have no plan to address this issue.
>>
>> The commit in question, was not intended for any previous Linux versions.
>> It was created as part of my handle_tx_event() rework series. Future changes
>> in said series could potentially trigger the issue, so preemptively preventing
>> it was both simpler and more secure.
> I don't know if I'm understanding this right, do you mean the issue mentioned in
> the commit will not be actually triggered in previous Linux versions? Now the commit
> is reverted in v6.1 and v6.6, but the issue can not be triggered in these versions,
> so no more fixes patch is needed for these LTS versions?

I'm not aware of any cases where this issue has been triggered. As it has been in the
Linux kernel for a long time, I assume it does not trigger.

Thanks,
Niklas