From 2770b7eecd5f73c857ec76e5492e18dc33a4c1f9 Mon Sep 17 00:00:00 2001
From: Andrew Kaster <akaster@serenityos.org>
Date: Thu, 9 May 2024 15:13:48 -0600
Subject: [PATCH] LibCore: Null-check struct addrinfo to avoid
 freeaddrinfo(NULL)

On some C libraries, like NetBSD and musl-libc, this under-specified
edge case results in a crash rather than silently ignoring the null
pointer.
---
 Userland/Libraries/LibCore/System.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index fb74bae9926..24f1f072237 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -264,7 +264,11 @@ private:
     }
 
     struct AddrInfoDeleter {
-        void operator()(struct addrinfo* ptr) { ::freeaddrinfo(ptr); }
+        void operator()(struct addrinfo* ptr)
+        {
+            if (ptr)
+                ::freeaddrinfo(ptr);
+        }
     };
 
     Vector<struct addrinfo> m_addresses {};