From c50ace654d877f442cf26c2043936eb005d46889 Mon Sep 17 00:00:00 2001
From: Colin Vidal <colin@isc.org>
Date: Sat, 18 Oct 2025 17:44:27 +0200
Subject: [PATCH] check memory context validity before mem_destory

Add a magic number check to ensure the memory context validity before
destorying it.

This check is needed now as it was done before implicitly when
isc_mem_inuse was called, but isc_mem_inuse is now called later (to be
able to dump the outstanding allocations).
---
 lib/isc/mem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/isc/mem.c b/lib/isc/mem.c
index 11d93f3ed6..7b391042d9 100644
--- a/lib/isc/mem.c
+++ b/lib/isc/mem.c
@@ -547,6 +547,8 @@ mem_create(const char *name, isc_mem_t **ctxp, unsigned int debugging,
 
 static void
 mem_destroy(isc_mem_t *ctx) {
+	REQUIRE(VALID_CONTEXT(ctx));
+
 	isc_refcount_destroy(&ctx->references);
 
 	LOCK(&contextslock);