From b57962b7c7de2b70fa943e66cd26b2cce631b7f8 Mon Sep 17 00:00:00 2001
From: Aaron Chen <aaronchen.lisp@gmail.com>
Date: Thu, 13 Nov 2025 01:43:03 +0000
Subject: bytes: fix panic in bytes.Buffer.Peek

This change fixed the overlooked offset in bytes.Buffer.Peek.
Otherwise, it will either return wrong result or panic with
"runtime error: slice bounds out of range".

Change-Id: Ic42fd8a27fb9703c51430f298933b91cf0d45451
GitHub-Last-Rev: fb97ebc3b188959835706626f66898d6306c16fb
GitHub-Pull-Request: golang/go#76165
Reviewed-on: https://go-review.googlesource.com/c/go/+/717640
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
---
 src/bytes/buffer.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/bytes/buffer.go')

diff --git a/src/bytes/buffer.go b/src/bytes/buffer.go
index 3eb5b350c3..6cb4d6a8f6 100644
--- a/src/bytes/buffer.go
+++ b/src/bytes/buffer.go
@@ -86,7 +86,7 @@ func (b *Buffer) Peek(n int) ([]byte, error) {
 	if b.Len() < n {
 		return b.buf[b.off:], io.EOF
 	}
-	return b.buf[b.off:n], nil
+	return b.buf[b.off : b.off+n], nil
 }
 
 // empty reports whether the unread portion of the buffer is empty.
-- 
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