From cf1eba61185e79f4a8e46c35767bd016bd30f313 Mon Sep 17 00:00:00 2001
From: kingluo <home_king@163.com>
Date: Thu, 27 Oct 2022 22:24:18 +0800
Subject: [PATCH] bugfix: clear tag in ngx_buf_t to avoid double free

---
 patches/nginx-1.21.4-clear_ngx_buf_tag.patch | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 patches/nginx-1.21.4-clear_ngx_buf_tag.patch

diff --git a/patches/nginx-1.21.4-clear_ngx_buf_tag.patch b/patches/nginx-1.21.4-clear_ngx_buf_tag.patch
new file mode 100644
index 0000000..74b0ecd
--- /dev/null
+++ b/patches/nginx-1.21.4-clear_ngx_buf_tag.patch
@@ -0,0 +1,11 @@
+diff -aNur nginx-1.21.4/src/core/ngx_buf.c nginx-1.21.4-patched/src/core/ngx_buf.c
+--- nginx-1.21.4/src/core/ngx_buf.c	2021-11-05 13:06:14.000000000 +0800
++++ nginx-1.21.4-patched/src/core/ngx_buf.c	2022-10-27 21:45:48.943152558 +0800
+@@ -213,6 +213,8 @@
+             break;
+         }
+ 
++        cl->buf->tag = 0;
++
+         cl->buf->pos = cl->buf->start;
+         cl->buf->last = cl->buf->start;