From: Jeff Davis <jdavis@postgresql.org>
Date: Fri, 4 Sep 2020 19:01:58 +0000 (-0700)
Subject: Fix bogus MaxAllocSize check in logtape.c.
X-Git-Tag: REL_14_BETA1~1724
X-Git-Url: http://git.postgresql.org/gitweb/?a=commitdiff_plain;h=0852006a946aa9795b4913bccebb88d623942ca6;p=postgresql.git

Fix bogus MaxAllocSize check in logtape.c.

Reported-by: Peter Geoghegan
Discussion: https://postgr.es/m/CAH2-Wz=NZPZc3-fkdmvu=w2itx0PiB-G6QpxHXZOjuvFAzPdZw@mail.gmail.com
Backpatch-through: 13
---

diff --git a/src/backend/utils/sort/logtape.c b/src/backend/utils/sort/logtape.c
index 788815cdab6..bbb01f6d337 100644
--- a/src/backend/utils/sort/logtape.c
+++ b/src/backend/utils/sort/logtape.c
@@ -491,7 +491,7 @@ ltsReleaseBlock(LogicalTapeSet *lts, long blocknum)
 		 * If the freelist becomes very large, just return and leak this free
 		 * block.
 		 */
-		if (lts->freeBlocksLen * 2 > MaxAllocSize)
+		if (lts->freeBlocksLen * 2 * sizeof(long) > MaxAllocSize)
 			return;
 
 		lts->freeBlocksLen *= 2;