From 561966a01f061123e6e4847f8bd662aa85b6f21f Mon Sep 17 00:00:00 2001
From: cw8466 <136645393+cw8466@users.noreply.github.com>
Date: Sat, 1 Jul 2023 10:28:28 -0400
Subject: [PATCH] [posix] fix missing `nullptr` pointer check (#9179)

Avoid segmentation fault for interfaces without link.
---
 src/posix/platform/infra_if.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/posix/platform/infra_if.cpp b/src/posix/platform/infra_if.cpp
index 2b37ceff3..505d02570 100644
--- a/src/posix/platform/infra_if.cpp
+++ b/src/posix/platform/infra_if.cpp
@@ -73,7 +73,8 @@ bool otPlatInfraIfHasAddress(uint32_t aInfraIfIndex, const otIp6Address *aAddres
     {
         struct sockaddr_in6 *ip6Addr;
 
-        if (if_nametoindex(addr->ifa_name) != aInfraIfIndex || addr->ifa_addr->sa_family != AF_INET6)
+        if (if_nametoindex(addr->ifa_name) != aInfraIfIndex || addr->ifa_addr == nullptr ||
+            addr->ifa_addr->sa_family != AF_INET6)
         {
             continue;
         }
@@ -316,7 +317,8 @@ void InfraNetif::CountAddresses(otSysInfraNetIfAddressCounters &aAddressCounters
     {
         in6_addr *in6Addr;
 
-        if (strncmp(addr->ifa_name, mInfraIfName, sizeof(mInfraIfName)) != 0 || addr->ifa_addr->sa_family != AF_INET6)
+        if (strncmp(addr->ifa_name, mInfraIfName, sizeof(mInfraIfName)) != 0 || addr->ifa_addr == nullptr ||
+            addr->ifa_addr->sa_family != AF_INET6)
         {
             continue;
         }
@@ -348,7 +350,8 @@ bool InfraNetif::HasLinkLocalAddress(void) const
     {
         struct sockaddr_in6 *ip6Addr;
 
-        if (strncmp(addr->ifa_name, mInfraIfName, sizeof(mInfraIfName)) != 0 || addr->ifa_addr->sa_family != AF_INET6)
+        if (strncmp(addr->ifa_name, mInfraIfName, sizeof(mInfraIfName)) != 0 || addr->ifa_addr == nullptr ||
+            addr->ifa_addr->sa_family != AF_INET6)
         {
             continue;
         }