From b9e1538fcf35708f19ce3f86c22b9bd91a0d2820 Mon Sep 17 00:00:00 2001
From: Michael Paquier <michael@paquier.xyz>
Date: Wed, 10 Jul 2019 15:15:23 +0900
Subject: [PATCH] Fix variable initialization when using buffering build with
GiST
This can cause valgrind to complain, as the flag marking a buffer as a
temporary copy was not getting initialized.
While on it, fill in with zeros newly-created buffer pages. This does
not matter when loading a block from a temporary file, but it makes the
push of an index tuple into a new buffer page safer.
This has been introduced by 1d27dcf, so backpatch all the way down to
9.4.
Author: Alexander Lakhin
Discussion: https://postgr.es/m/15899-0d24fb273b3dd90c@postgresql.org
Backpatch-through: 9.4
---
src/backend/access/gist/gistbuildbuffers.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/backend/access/gist/gistbuildbuffers.c b/src/backend/access/gist/gistbuildbuffers.c
index 9b401882c89..3a140aa2f78 100644
--- a/src/backend/access/gist/gistbuildbuffers.c
+++ b/src/backend/access/gist/gistbuildbuffers.c
@@ -138,6 +138,7 @@ gistGetNodeBuffer(GISTBuildBuffers *gfbb, GISTSTATE *giststate,
nodeBuffer->pageBlocknum = InvalidBlockNumber;
nodeBuffer->pageBuffer = NULL;
nodeBuffer->queuedForEmptying = false;
+ nodeBuffer->isTemp = false;
nodeBuffer->level = level;
/*
@@ -186,8 +187,8 @@ gistAllocateNewPageBuffer(GISTBuildBuffers *gfbb)
{
GISTNodeBufferPage *pageBuffer;
- pageBuffer = (GISTNodeBufferPage *) MemoryContextAlloc(gfbb->context,
- BLCKSZ);
+ pageBuffer = (GISTNodeBufferPage *) MemoryContextAllocZero(gfbb->context,
+ BLCKSZ);
pageBuffer->prev = InvalidBlockNumber;
/* Set page free space */
--
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