From 964fad174d57ce8280afe92a652140ebb846141e Mon Sep 17 00:00:00 2001
From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Tue, 8 Sep 2026 15:46:52 -0700
Subject: [PATCH] Memory pool: junk filling only in debug builds

Previously, every freed chunk was overwritten with 0x5A in all builds,
adding a memset to each njs_mp_free() call.

The fix is to keep the junk filling under NJS_DEBUG.  Release builds no
longer poison freed chunks; nothing ever inspected the pattern.
---
 src/njs_mp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/njs_mp.c b/src/njs_mp.c
index f1d464a3..83fb76db 100644
--- a/src/njs_mp.c
+++ b/src/njs_mp.c
@@ -120,9 +120,15 @@ struct njs_mp_s {
     map[chunk / 8] &= ~(0x80 >> (chunk & 7))
 
 
+#if (NJS_DEBUG)
 #define njs_mp_free_junk(p, size)                                             \
     njs_memset((p), 0x5A, size)
 
+#else
+#define njs_mp_free_junk(p, size)
+
+#endif
+
 
 #define njs_is_power_of_two(value)                                            \
     ((((value) - 1) & (value)) == 0)
-- 
2.47.3