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Prevent sorting from requesting a SortTuple array that exceeds MaxAllocSize; 

we'll go over to disk-based sort if we reach that limit.
This fixes Stefan Kaltenbrunner's observation that sorting can suffer an
'invalid memory alloc request size' failure when sort_mem is set large
enough.  It's unfortunately not so easy to fix in 8.1 ...
This commit is contained in:
Tom Lane 2006-03-04 19:05:06 +00:00
parent b3d0442ab3
commit 80cadb303c
1 changed files with 8 additions and 1 deletions
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9
src/backend/utils/sort/tuplesort.c
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@ -91,7 +91,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.60 2006/02/26 22:58:12 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.61 2006/03/04 19:05:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -741,6 +741,13 @@ grow_memtuples(Tuplesortstate *state)
*/
if (state->availMem <= (long) (state->memtupsize * sizeof(SortTuple)))
return false;
/*
* On a 64-bit machine, allowedMem could be high enough to get us into
* trouble with MaxAllocSize, too.
*/
if ((Size) (state->memtupsize * 2) >= MaxAllocSize / sizeof(SortTuple))
return false;
FREEMEM(state, GetMemoryChunkSpace(state->memtuples));
state->memtupsize *= 2;
state->memtuples = (SortTuple *)