From 440e1fce5fc1787082dd4a81a1b252425a469397 Mon Sep 17 00:00:00 2001
From: mrproliu <741550557@qq.com>
Date: Tue, 11 Mar 2025 10:35:16 +0800
Subject: [PATCH] Fix Combine buffer panic when analyze protocol

---
 pkg/tools/buffer/buffer.go | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/pkg/tools/buffer/buffer.go b/pkg/tools/buffer/buffer.go
index 33f6d1c0..5a2ed134 100644
--- a/pkg/tools/buffer/buffer.go
+++ b/pkg/tools/buffer/buffer.go
@@ -437,9 +437,18 @@ func CombineSlices(validated bool, originalBuffer *Buffer, buffers ...*Buffer) *
 		}
 	}
 
-	var endPosition = buffers[len(buffers)-1].endPosition
-	if endPosition == nil {
-		endPosition = buffers[len(buffers)-1].Position()
+	var endPosition *Position
+	for i := len(buffers) - 1; i >= 0; i-- {
+		if buffers[i] == nil {
+			continue
+		}
+		if buffers[i].endPosition != nil {
+			endPosition = buffers[i].endPosition
+			break
+		} else if buffers[i].Position() != nil {
+			endPosition = buffers[i].Position()
+			break
+		}
 	}
 	return &Buffer{
 		dataEvents:     dataEvents,