Re: [HACKERS] Suspicious place in heap_prepare_freeze_tuple() - Mailing list pgsql-hackers

On Thu, Jul 6, 2017 at 1:36 AM, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
> Teodor Sigaev wrote:
>
>> Playing around freezing tuple I found suspicious piece of code:
>>
>> heap_prepare_freeze_tuple():
>> ...
>> frz->t_infomask = tuple->t_infomask;
>> ...
>>             frz->t_infomask &= ~HEAP_XMAX_BITS;
>>             frz->xmax = newxmax;
>>             if (flags & FRM_MARK_COMMITTED)
>>                 frz->t_infomask &= HEAP_XMAX_COMMITTED;
>>
>> Seems, in last line it should be a bitwise OR instead of AND. Now this line
>> cleans all bits in t_infomask which later will be copied directly in tuple.
>
> I think you're right.
>

I also think that's right. Should we back-patch it down to 9.3?

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center