go: fix CVE-2025-61724

The Reader.ReadResponse function constructs a response string through
repeated string concatenation of lines. When the number of lines in a
response is large, this can cause excessive CPU consumption.

(From OE-Core rev: 512c36af3b9d344606b2ebf54bc2f99b88dfea63)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.22.12.inc b/meta/recipes-devtools/go/go-1.22.12.inc
index 9996cfb870..825b8f4d68 100644
--- a/meta/recipes-devtools/go/go-1.22.12.inc
+++ b/meta/recipes-devtools/go/go-1.22.12.inc
@@ -27,6 +27,7 @@ SRC_URI += "\
     file://CVE-2025-58189.patch \
     file://CVE-2025-47912.patch \
     file://CVE-2025-61723.patch \
+    file://CVE-2025-61724.patch \
 "
 SRC_URI[main.sha256sum] = "012a7e1f37f362c0918c1dfa3334458ac2da1628c4b9cf4d9ca02db986e17d71"
 
diff --git a/meta/recipes-devtools/go/go/CVE-2025-61724.patch b/meta/recipes-devtools/go/go/CVE-2025-61724.patch
new file mode 100644
index 0000000000..a91c24508e
--- /dev/null
+++ b/meta/recipes-devtools/go/go/CVE-2025-61724.patch
@@ -0,0 +1,75 @@
+From a402f4ad285514f5f3db90516d72047d591b307a Mon Sep 17 00:00:00 2001
+From: Damien Neil <dneil@google.com>
+Date: Tue, 30 Sep 2025 15:11:16 -0700
+Subject: [PATCH] net/textproto: avoid quadratic complexity in
+ Reader.ReadResponse
+
+Reader.ReadResponse constructed a response string from repeated
+string concatenation, permitting a malicious sender to cause excessive
+memory allocation and CPU consumption by sending a response consisting
+of many short lines.
+
+Use a strings.Builder to construct the string instead.
+
+Thanks to Jakub Ciolek for reporting this issue.
+
+Fixes CVE-2025-61724
+For #75716
+Fixes #75717
+
+Change-Id: I1a98ce85a21b830cb25799f9ac9333a67400d736
+Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2940
+Reviewed-by: Roland Shoemaker <bracewell@google.com>
+Reviewed-by: Nicholas Husin <husin@google.com>
+Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2980
+Reviewed-by: Damien Neil <dneil@google.com>
+Reviewed-on: https://go-review.googlesource.com/c/go/+/709837
+Reviewed-by: Carlos Amedee <carlos@golang.org>
+TryBot-Bypass: Michael Pratt <mpratt@google.com>
+Auto-Submit: Michael Pratt <mpratt@google.com>
+
+CVE: CVE-2025-61724
+
+Upstream-Status: Backport [https://github.com/golang/go/commit/a402f4ad285514f5f3db90516d72047d591b307a]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ src/net/textproto/reader.go | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/src/net/textproto/reader.go b/src/net/textproto/reader.go
+index 7930211..0027efe 100644
+--- a/src/net/textproto/reader.go
++++ b/src/net/textproto/reader.go
+@@ -283,8 +283,10 @@ func (r *Reader) ReadCodeLine(expectCode int) (code int, message string, err err
+ //
+ // An expectCode <= 0 disables the check of the status code.
+ func (r *Reader) ReadResponse(expectCode int) (code int, message string, err error) {
+-       code, continued, message, err := r.readCodeLine(expectCode)
++       code, continued, first, err := r.readCodeLine(expectCode)
+        multi := continued
++       var messageBuilder strings.Builder
++       messageBuilder.WriteString(first)
+        for continued {
+                line, err := r.ReadLine()
+                if err != nil {
+@@ -295,12 +297,15 @@ func (r *Reader) ReadResponse(expectCode int) (code int, message string, err err
+                var moreMessage string
+                code2, continued, moreMessage, err = parseCodeLine(line, 0)
+                if err != nil || code2 != code {
+-                       message += "\n" + strings.TrimRight(line, "\r\n")
++                       messageBuilder.WriteByte('\n')
++                       messageBuilder.WriteString(strings.TrimRight(line, "\r\n"))
+                        continued = true
+                        continue
+                }
+-               message += "\n" + moreMessage
++               messageBuilder.WriteByte('\n')
++               messageBuilder.WriteString(moreMessage)
+        }
++       message = messageBuilder.String()
+        if err != nil && multi && message != "" {
+                // replace one line error message with all lines (full message)
+                err = &Error{code, message}
+--
+2.40.0