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Date: Mon, 26 Oct 2015 23:03:55 +0100
From: Hauke Mehrtens <>
Cc: Hauke Mehrtens <>
Subject: [PATCH] getnameinfo: make size check not fail for bigger sizes

getnameinfo() compares the size of the given struct sockaddr with
sizeof(struct sockaddr_in) and sizeof(struct sockaddr_in6) depending on
the net family. When you add a sockaddr of size sizeof(struct
sockaddr_storage) this function will fail because the size of the
sockaddr is too big. Change the check that it only fails if the size is
too small, but make it work when it is too big for example when someone
calls this function with a struct sockaddr_storage and its size.
This fixes a problem with IoTivity 1.0.0 and musl.

glibc and bionic are only failing if it is smaller, net/freebsd
implemented the != check.

Signed-off-by: Hauke Mehrtens <>
 src/network/getnameinfo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Please add me in CC.

diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c
index 3484fc6..5e6fae3 100644
--- a/src/network/getnameinfo.c
+++ b/src/network/getnameinfo.c
@@ -135,13 +135,13 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
 	switch (af) {
 	case AF_INET:
 		a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
-		if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY;
+		if (sl < sizeof(struct sockaddr_in)) return EAI_FAMILY;
 		mkptr4(ptr, a);
 		scopeid = 0;
 	case AF_INET6:
 		a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
-		if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY;
+		if (sl < sizeof(struct sockaddr_in6)) return EAI_FAMILY;
 		if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12))
 			mkptr6(ptr, a);

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