Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Nov 15, 2021 at 09:39:53AM -0800, Greg Thelen wrote:
>> The patch titled ("perf/core: Avoid put_page() when GUP fails") has been
>> merged into linus/master as commit
>> 4716023a8f6a0f4a28047f14dd7ebdc319606b84.
>>
>> The patch fixes an issue present in all v4.14+ kernels that can cause
>> page reference count underflow, which can lead to unintentional page
>> sharing.
>>
>> The patch did not have cc: stable footer, so I'm manually requesting
>> -stable inclusion into v4.14+.
>>
>> There are some trivial conflicts in older kernels. I'd be happy to
>> review/test, if that's useful.
>
> Please provide working versions for 4.14, 4.19, and 5.4. The others
> kernels applied just fine.
>
> thanks,
>
> greg k-h
Done. Backported and tested on stable 4.14-y, 4.19-y, and 5.4-y:
https://lore.kernel.org/stable/20211122171825.1582436-1-gthelen@xxxxxxxxxx/
https://lore.kernel.org/stable/20211122171824.1582407-1-gthelen@xxxxxxxxxx/
https://lore.kernel.org/stable/20211122171818.1582357-1-gthelen@xxxxxxxxxx/
