From aa1556156ea861e7746228bf2a1ee686d22e2e24 Mon Sep 17 00:00:00 2001
From: Brandon Black <bblack@wikimedia.org>
Date: Sun, 29 Jun 2025 10:22:19 -0500
Subject: [PATCH] std.posix.getsockopt: set option length correctly

Fixes #24293
---
 lib/std/posix.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index 7a517b9a47..9fb55db0c8 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -4335,7 +4335,7 @@ pub const GetSockOptError = error{
 } || UnexpectedError;
 
 pub fn getsockopt(fd: socket_t, level: i32, optname: u32, opt: []u8) GetSockOptError!void {
-    var len: socklen_t = undefined;
+    var len: socklen_t = @intCast(opt.len);
     switch (errno(system.getsockopt(fd, level, optname, opt.ptr, &len))) {
         .SUCCESS => {
             std.debug.assert(len == opt.len);