[PATCH] selinux: Fix address length checks in connect hook

This patch fixes the address length checks in the selinux_socket_connect
hook to be no more restrictive than the underlying ipv4 and ipv6 code;
otherwise, this hook can reject valid connect calls.  This patch is in
response to a bug report where an application was calling connect on an
INET6 socket with an address that didn't include the optional scope id and
failing due to these checks.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

security/selinux/hooks.c

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 10fd51c..2253f38 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3126,12 +3126,12 @@
 
 		if (sk->sk_family == PF_INET) {
 			addr4 = (struct sockaddr_in *)address;
-			if (addrlen != sizeof(struct sockaddr_in))
+			if (addrlen < sizeof(struct sockaddr_in))
 				return -EINVAL;
 			snum = ntohs(addr4->sin_port);
 		} else {
 			addr6 = (struct sockaddr_in6 *)address;
-			if (addrlen != sizeof(struct sockaddr_in6))
+			if (addrlen < SIN6_LEN_RFC2133)
 				return -EINVAL;
 			snum = ntohs(addr6->sin6_port);
 		}