[patch 57/71] ipv6: Fix commit 63d9950b08184e6531adceb65f64b429909cc101 (ipv6: Make v4-mapped bindings consistent with IPv4)

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>

commit ca6982b858e1d08010c1d29d8e8255b2ac2ad70a upstream.

Commit 63d9950b08184e6531adceb65f64b429909cc101
  (ipv6: Make v4-mapped bindings consistent with IPv4)
changes behavior of inet6_bind() for v4-mapped addresses so it should
behave the same way as inet_bind().

During this change setting of err to -EADDRNOTAVAIL got lost:

af_inet.c:469 inet_bind()
	err = -EADDRNOTAVAIL;
	if (!sysctl_ip_nonlocal_bind &&
	    !(inet->freebind || inet->transparent) &&
	    addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
	    chk_addr_ret != RTN_LOCAL &&
	    chk_addr_ret != RTN_MULTICAST &&
	    chk_addr_ret != RTN_BROADCAST)
		goto out;


af_inet6.c:463 inet6_bind()
	if (addr_type == IPV6_ADDR_MAPPED) {
		int chk_addr_ret;

		/* Binding to v4-mapped address on a v6-only socket
		 * makes no sense
		 */
		if (np->ipv6only) {
			err = -EINVAL;
			goto out;
		}

		/* Reproduce AF_INET checks to make the bindings consitant */
		v4addr = addr->sin6_addr.s6_addr32[3];
		chk_addr_ret = inet_addr_type(net, v4addr);
		if (!sysctl_ip_nonlocal_bind &&
		    !(inet->freebind || inet->transparent) &&
		    v4addr != htonl(INADDR_ANY) &&
		    chk_addr_ret != RTN_LOCAL &&
		    chk_addr_ret != RTN_MULTICAST &&
		    chk_addr_ret != RTN_BROADCAST)
			goto out;
	} else {


Signed-off-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>

---
 net/ipv6/af_inet6.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -294,8 +294,10 @@ int inet6_bind(struct socket *sock, stru
 		    v4addr != htonl(INADDR_ANY) &&
 		    chk_addr_ret != RTN_LOCAL &&
 		    chk_addr_ret != RTN_MULTICAST &&
-		    chk_addr_ret != RTN_BROADCAST)
+		    chk_addr_ret != RTN_BROADCAST) {
+			err = -EADDRNOTAVAIL;
 			goto out;
+		}
 	} else {
 		if (addr_type != IPV6_ADDR_ANY) {
 			struct net_device *dev = NULL;


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