From b977899926da99484ca6b891dc36ec799a7b1d9f Mon Sep 17 00:00:00 2001
From: hmol233 <82594500+hmol233@users.noreply.github.com>
Date: Mon, 14 Jun 2021 20:40:17 +0800
Subject: [PATCH 1/3] Check buffer before releasing

to avoid `extending out of bound` issue in some cases
---
 common/buf/buffer.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/buf/buffer.go b/common/buf/buffer.go
index 9eef9997..7c8f965d 100644
--- a/common/buf/buffer.go
+++ b/common/buf/buffer.go
@@ -27,7 +27,7 @@ type Buffer struct {
 // New creates a Buffer with 0 length and 2K capacity.
 func New() *Buffer {
 	return &Buffer{
-		v: pool.Get().([]byte),
+		v: buf,
 	}
 }
 
@@ -64,7 +64,10 @@ func (b *Buffer) Release() {
 	p := b.v
 	b.v = nil
 	b.Clear()
-	pool.Put(p)
+
+	if cap(p) >= Size {
+		pool.Put(p)
+	}
 	b.UDP = nil
 }
 

From 3531b95d829978f99ef4a53af27f433076868261 Mon Sep 17 00:00:00 2001
From: hmol233 <82594500+hmol233@users.noreply.github.com>
Date: Mon, 14 Jun 2021 20:43:48 +0800
Subject: [PATCH 2/3] ?

---
 common/buf/buffer.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/common/buf/buffer.go b/common/buf/buffer.go
index 7c8f965d..baca8238 100644
--- a/common/buf/buffer.go
+++ b/common/buf/buffer.go
@@ -26,6 +26,13 @@ type Buffer struct {
 
 // New creates a Buffer with 0 length and 2K capacity.
 func New() *Buffer {
+	buf := pool.Get().([]byte)
+	if cap(buf) >= Size {
+		buf = buf[:Size]
+	} else {
+		buf = make([]byte, Size)
+	}
+
 	return &Buffer{
 		v: buf,
 	}

From e4bf620795cad98862467f7ed74d76440d6c6e1e Mon Sep 17 00:00:00 2001
From: hmol233 <82594500+hmol233@users.noreply.github.com>
Date: Sat, 10 Jul 2021 16:41:23 +0800
Subject: [PATCH 3/3] minor tweak

---
 common/buf/buffer.go | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/common/buf/buffer.go b/common/buf/buffer.go
index baca8238..4878b0b6 100644
--- a/common/buf/buffer.go
+++ b/common/buf/buffer.go
@@ -24,7 +24,7 @@ type Buffer struct {
 	UDP   *net.Destination
 }
 
-// New creates a Buffer with 0 length and 2K capacity.
+// New creates a Buffer with 0 length and 8K capacity.
 func New() *Buffer {
 	buf := pool.Get().([]byte)
 	if cap(buf) >= Size {
@@ -57,8 +57,15 @@ func NewExisted(b []byte) *Buffer {
 // StackNew creates a new Buffer object on stack.
 // This method is for buffers that is released in the same function.
 func StackNew() Buffer {
+	buf := pool.Get().([]byte)
+	if cap(buf) >= Size {
+		buf = buf[:Size]
+	} else {
+		buf = make([]byte, Size)
+	}
+
 	return Buffer{
-		v: pool.Get().([]byte),
+		v: buf,
 	}
 }
 
@@ -72,7 +79,7 @@ func (b *Buffer) Release() {
 	b.v = nil
 	b.Clear()
 
-	if cap(p) >= Size {
+	if cap(p) == Size {
 		pool.Put(p)
 	}
 	b.UDP = nil