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openssl3/0017-use-AI-ADDRCONFIG-expl...

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diff -up openssl-3.0.0-alpha16/crypto/bio/bio_addr.c.use-explicit openssl-3.0.0-alpha16/crypto/bio/bio_addr.c
--- openssl-3.0.0-alpha16/crypto/bio/bio_addr.c.use-explicit 2021-07-06 14:06:05.706578389 +0200
+++ openssl-3.0.0-alpha16/crypto/bio/bio_addr.c 2021-07-06 14:07:24.482329505 +0200
@@ -696,7 +696,7 @@ int BIO_lookup_ex(const char *host, cons
hints.ai_protocol = protocol;
# ifdef AI_ADDRCONFIG
# ifdef AF_UNSPEC
- if (family == AF_UNSPEC)
+ if (host != NULL && family == AF_UNSPEC)
# endif
hints.ai_flags |= AI_ADDRCONFIG;
# endif