From: Michael Paquier <michael@paquier.xyz>
Date: Mon, 6 Jul 2026 00:32:25 +0000 (+0900)
Subject: amcheck: Fix memory leak with gin_index_check()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e939332c6b1c7750f161424d8fbf8989b11cb5f6;p=thirdparty%2Fpostgresql.git

amcheck: Fix memory leak with gin_index_check()

"prev_tuple" was overwritten with a new tuple coming from
CopyIndexTuple() on each loop, leaking memory for every tuple processed
on entry tree pages.  The function uses a dedicated memory context, but
this could leave unused large areas of memory while processing a large
GIN index, the larger the worse.

Oversight in 14ffaece0fb5.

Author: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: Ewan Young <kdbase.hack@gmail.com>
Discussion: https://postgr.es/m/CALdSSPjTS6TYe5=5NfMUBYZyQu5cn=ABL6K5_OZjzGWqnwXeBw@mail.gmail.com
Backpatch-through: 18
---

diff --git a/contrib/amcheck/verify_gin.c b/contrib/amcheck/verify_gin.c
index abfad07d5e4..fa06689ed5b 100644
--- a/contrib/amcheck/verify_gin.c
+++ b/contrib/amcheck/verify_gin.c
@@ -637,6 +637,9 @@ gin_check_parent_keys_consistency(Relation rel,
 				pfree(ipd);
 			}
 
+			if (prev_tuple)
+				pfree(prev_tuple);
+
 			prev_tuple = CopyIndexTuple(idxtuple);
 			prev_attnum = current_attnum;
 		}