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From: Hiroki Sato <hrs@FreeBSD.org>
Date: Tue, 3 Nov 2015 00:46:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r290318 - head/lib/libc/net
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Author: hrs
Date: Tue Nov  3 00:46:06 2015
New Revision: 290318
URL: https://svnweb.freebsd.org/changeset/base/290318

Log:
  sdl->sdl_len in sockaddr_dl can be longer than
  sizeof(struct sockaddr_dl).

Modified:
  head/lib/libc/net/getnameinfo.c

Modified: head/lib/libc/net/getnameinfo.c
==============================================================================
--- head/lib/libc/net/getnameinfo.c	Tue Nov  3 00:21:23 2015	(r290317)
+++ head/lib/libc/net/getnameinfo.c	Tue Nov  3 00:46:06 2015	(r290318)
@@ -122,7 +122,8 @@ getnameinfo(const struct sockaddr *sa, s
 	afd = find_afd(sa->sa_family);
 	if (afd == NULL)
 		return (EAI_FAMILY);
-	if (sa->sa_family == PF_LOCAL) {
+	switch (sa->sa_family) {
+	case PF_LOCAL:
 		/*
 		 * PF_LOCAL uses variable sa->sa_len depending on the
 		 * content length of sun_path.  Require 1 byte in
@@ -132,8 +133,17 @@ getnameinfo(const struct sockaddr *sa, s
 		    salen <= afd->a_socklen -
 			sizeofmember(struct sockaddr_un, sun_path))
 			return (EAI_FAIL);
-	} else if (salen != afd->a_socklen)
-		return (EAI_FAIL);
+		break;
+	case PF_LINK:
+		if (salen <= afd->a_socklen -
+			sizeofmember(struct sockaddr_dl, sdl_data))
+			return (EAI_FAIL);
+		break;
+	default:
+		if (salen != afd->a_socklen)
+			return (EAI_FAIL);
+		break;
+	}
 
 	return ((*afd->a_func)(afd, sa, salen, host, hostlen,
 	    serv, servlen, flags));