From df0dfa634d54904ea9e0714547547131a6b2da10 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@nginx.com>
Date: Tue, 2 Oct 2018 13:32:52 +0300
Subject: [PATCH] Fixed off-by-one error in shared zone initialization.

On systems without atomic ops, not enough space was allocated
for mutex's file name during shared zone initialization.
---
 src/core/ngx_cycle.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index f3ac24d7a..083c76488 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -921,7 +921,8 @@ ngx_init_zone_pool(ngx_cycle_t *cycle, ngx_shm_zone_t *zn)
 
 #else
 
-    file = ngx_pnalloc(cycle->pool, cycle->lock_file.len + zn->shm.name.len);
+    file = ngx_pnalloc(cycle->pool,
+                       cycle->lock_file.len + zn->shm.name.len + 1);
     if (file == NULL) {
         return NGX_ERROR;
     }