From 4f115fc314646500f7b4178d7248a02654c7cd10 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 30 Nov 2018 16:47:57 -0800
Subject: [PATCH] Do not pass null pointer to freeaddrinfo()

Passing null pointer as input parameter to freeaddrinfo() is undefined
behaviour, some libcs e.g. glibc might just call free() which does
accept null pointer but other libcs e.g. musl might not and instead
cause the program to segfault. Therefore do not rely on undefined
behaviour instead make it deterministic

Upstream-Status: Pending

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 support/export/client.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: nfs-utils-2.3.2/support/export/client.c
===================================================================
--- nfs-utils-2.3.2.orig/support/export/client.c
+++ nfs-utils-2.3.2/support/export/client.c
@@ -309,7 +309,8 @@ client_lookup(char *hname, int canonical
 		init_addrlist(clp, ai);
 
 out:
-	freeaddrinfo(ai);
+	if (ai)
+		freeaddrinfo(ai);
 	return clp;
 }