Re: [PATCH] Fix Uninitialized scalar variable (UNINIT) (src/backend/access/heap/heapam_handler.c)

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Ranier Vilela <ranier(dot)vf(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: [PATCH] Fix Uninitialized scalar variable (UNINIT) (src/backend/access/heap/heapam_handler.c)
Date: 2020-08-25 23:13:20
Message-ID: 20200825231320.GA30222@alvherre.pgsql
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On 2020-Aug-25, Ranier Vilela wrote:

> Em ter., 25 de ago. de 2020 às 19:45, Alvaro Herrera <
> alvherre(at)2ndquadrant(dot)com> escreveu:
>
> > On 2020-Aug-25, Ranier Vilela wrote:
> >
> > > If the variable hscan->rs_cblock is InvalidBlockNumber the test can
> > > protect root_offsets fail.
> >
> > When does that happen?
>
> At first pass into the while loop?
> hscan->rs_cblock is InvalidBlockNumber, what happens?

No, it is set when the page is read.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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