From e501d58e9ec6cb6e19a682d425fa638069585fbc Mon Sep 17 00:00:00 2001
Message-ID: <e501d58e9ec6cb6e19a682d425fa638069585fbc.1687508149.git.stefan@agner.ch>
In-Reply-To: <e136dcdcdd93ef32ada981e89c195905eb809eea.1687508149.git.stefan@agner.ch>
References: <e136dcdcdd93ef32ada981e89c195905eb809eea.1687508149.git.stefan@agner.ch>
From: Stefan Agner <stefan@agner.ch>
Date: Fri, 23 Jun 2023 10:10:00 +0200
Subject: [PATCH] Handle interface without `ifa_addr`

It seems that certain interface types may have `ifa_addr` set to null.
Handle this case gracefully.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
 mDNSPosix/mDNSPosix.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mDNSPosix/mDNSPosix.c b/mDNSPosix/mDNSPosix.c
index 89e108f..2056871 100644
--- a/mDNSPosix/mDNSPosix.c
+++ b/mDNSPosix/mDNSPosix.c
@@ -1895,6 +1895,7 @@ mDNSlocal void InterfaceChangeCallback(int fd, void *context)
 	    continue;
 
         if ((ifa_loop4 == NULL) &&
+            ((*ifi)->ifa_addr != NULL) &&
             ((*ifi)->ifa_addr->sa_family == AF_INET) &&
             ((*ifi)->ifa_flags & IFF_UP) &&
             ((*ifi)->ifa_flags & IFF_LOOPBACK))
@@ -1903,7 +1904,8 @@ mDNSlocal void InterfaceChangeCallback(int fd, void *context)
             continue;
         }
 
-        if (     (((*ifi)->ifa_addr->sa_family == AF_INET)
+        if (     ((*ifi)->ifa_addr != NULL) &&
+                 (((*ifi)->ifa_addr->sa_family == AF_INET)
 #if HAVE_IPV6
                   || ((*ifi)->ifa_addr->sa_family == AF_INET6)
 #endif
-- 
2.41.0