vfix-0001-fix-size-overflow.patch

From 4f128c5cbdb11c4d9b1882d39b75338c854ba30e Mon Sep 17 00:00:00 2001
From: Tomas Vondra <tomas@vondra.me>
Date: Wed, 24 Sep 2025 14:30:31 +0200
Subject: [PATCH vfix 1/4] fix size overflow

---
 src/backend/executor/nodeHash.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c
index 8d2201ab67f..ef589b90339 100644
--- a/src/backend/executor/nodeHash.c
+++ b/src/backend/executor/nodeHash.c
@@ -913,10 +913,12 @@ ExecChooseHashTableSize(double ntuples, int tupwidth, bool useskew,
 	while (nbatch > 0)
 	{
 		/* how much memory are we using with current nbatch value */
-		size_t		current_space = hash_table_bytes + (2 * nbatch * BLCKSZ);
+		size_t		current_space =
+			hash_table_bytes + (2 * nbatch * (size_t) BLCKSZ);
 
 		/* how much memory would we use with half the batches */
-		size_t		new_space = hash_table_bytes * 2 + (nbatch * BLCKSZ);
+		size_t		new_space =
+			hash_table_bytes * 2 + (nbatch * (size_t) BLCKSZ);
 
 		/* If the memory usage would not decrease, we found the optimum. */
 		if (current_space < new_space)
@@ -995,7 +997,7 @@ ExecHashIncreaseBatchSize(HashJoinTable hashtable)
 	 * How much additional memory would doubling nbatch use? Each batch may
 	 * require two buffered files (inner/outer), with a BLCKSZ buffer.
 	 */
-	size_t		batchSpace = (hashtable->nbatch * 2 * BLCKSZ);
+	size_t		batchSpace = (hashtable->nbatch * 2 * (size_t) BLCKSZ);
 
 	/*
 	 * Compare the new space needed for doubling nbatch and for enlarging the
-- 
2.51.0