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From 1cc54320306e07c1fc0eed98e7fbcbb07a2f3b28 Mon Sep 17 00:00:00 2001
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.
Upstream-Status: Submitted [https://github.com/apple-oss-distributions/mDNSResponder/pull/2/commits/11b410d4d683c90e693c40315997bb3e8ec90e9a]
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
---
mDNSPosix/mDNSPosix.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mDNSPosix/mDNSPosix.c b/mDNSPosix/mDNSPosix.c
index d7f31cc4d5cf..f10301253f58 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
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