From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Tue, 13 Feb 2024 19:23:41 +0000 (+0200)
Subject: Fix 'mmap' DSM implementation with allocations larger than 4 GB
X-Git-Tag: REL_12_19~61
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=95cc48ca0dcb71beb1a6d1c7e768f87139e9c195;p=thirdparty%2Fpostgresql.git

Fix 'mmap' DSM implementation with allocations larger than 4 GB

Fixes bug #18341. Backpatch to all supported versions.

Discussion: https://www.postgresql.org/message-id/18341-ce16599e7fd6228c@postgresql.org
---

diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c
index a5dbd662b2f..5f96bcf5b2f 100644
--- a/src/backend/storage/ipc/dsm_impl.c
+++ b/src/backend/storage/ipc/dsm_impl.c
@@ -868,7 +868,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 		 * transferring data to the kernel.
 		 */
 		char	   *zbuffer = (char *) palloc0(ZBUFFER_SIZE);
-		uint32		remaining = request_size;
+		Size		remaining = request_size;
 		bool		success = true;
 
 		/*