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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
This commit is contained in:
Michael Paquier 2019-07-10 15:14:54 +09:00
parent 5a7d697a39
commit fa19a08d71
1 changed files with 3 additions and 2 deletions
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5
src/backend/access/gist/gistbuildbuffers.c
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@ -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 */