From: database64128 <free122448@hotmail.com>
Date: Fri, 1 Aug 2025 16:34:48 +0000 (+0800)
Subject: syscall: permit nil destination address in sendmsgN{Inet4,Inet6}
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=3871c0d84d214bdecc370c8717c71a9a155a363f;p=gostls13.git

syscall: permit nil destination address in sendmsgN{Inet4,Inet6}

For #74841

Change-Id: Ic3ef9c61a89bc8bc0594724a6d94eed91fb63eae
Reviewed-on: https://go-review.googlesource.com/c/go/+/692435
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
---

diff --git a/src/syscall/syscall_unix.go b/src/syscall/syscall_unix.go
index ecd5952975..7de2272b59 100644
--- a/src/syscall/syscall_unix.go
+++ b/src/syscall/syscall_unix.go
@@ -410,17 +410,25 @@ func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error)
 }
 
 func sendmsgNInet4(fd int, p, oob []byte, to *SockaddrInet4, flags int) (n int, err error) {
-	ptr, salen, err := to.sockaddr()
-	if err != nil {
-		return 0, err
+	var ptr unsafe.Pointer
+	var salen _Socklen
+	if to != nil {
+		ptr, salen, err = to.sockaddr()
+		if err != nil {
+			return 0, err
+		}
 	}
 	return sendmsgN(fd, p, oob, ptr, salen, flags)
 }
 
 func sendmsgNInet6(fd int, p, oob []byte, to *SockaddrInet6, flags int) (n int, err error) {
-	ptr, salen, err := to.sockaddr()
-	if err != nil {
-		return 0, err
+	var ptr unsafe.Pointer
+	var salen _Socklen
+	if to != nil {
+		ptr, salen, err = to.sockaddr()
+		if err != nil {
+			return 0, err
+		}
 	}
 	return sendmsgN(fd, p, oob, ptr, salen, flags)
 }