Re: [PATCH 1/1] xhci: Fix null pointer dereference during S4 resume when resetting ep0

[Mathias Nyman <mathias.nyman@linux.intel.com>]

On 15.12.2023 19.27, Greg KH wrote:
> On Fri, Dec 15, 2023 at 02:57:07PM +0200, Mathias Nyman wrote:
>> During device enumeration usb core resets endpoint 0 if the max packet
>> size value differs from the one read from the device descriptor.
>>
>> usb core will additionally reset endpoint 0 during S4 resume, before
>> re-enumerating the device, if the device has a reset-resume flag set.
>>
>> In this case the xhci device representation vdev may be lost due to
>> xHC restore error and re-initialization during S4 resume.
>>
>> Make sure slot_id and vdev are valid before trying to re-configure max
>> packet size during endpoint 0 reset.
>> max packet size will be re-configured later during re-enumeration.
>>
>> This fixes commit e34900f46cd6 ("xhci: Reconfigure endpoint 0 max packet
>> size only during endpoint reset") which is currently in usb-next,
>> on its way to 6.7
> 
> You mean "6.8" here, right?

Ah, yes it should be 6.8, my mistake.

Thanks
Mathias