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Index: head/lib/libc/net/if_indextoname.c
===================================================================
--- head/lib/libc/net/if_indextoname.c
+++ head/lib/libc/net/if_indextoname.c
@@ -66,6 +66,11 @@
struct ifaddrs *ifaddrs, *ifa;
int error = 0;
+ if (ifindex == 0) {
+ errno = ENXIO;
+ return(NULL);
+ }
+
if (getifaddrs(&ifaddrs) < 0)
return(NULL); /* getifaddrs properly set errno */

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