netdev - [PATCH 4/5] [SCTP]: IPv4 vs IPv6 addresses mess in sctp_inet[6]addr

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Date:	Thu, 10 Apr 2008 14:18:33 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	davem@...emloft.net
Cc:	lksctp-developers@...ts.sourceforge.net,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	Pavel Emelyanov <xemul@...nvz.org>,
	Vlad Yasevich <vladislav.yasevich@...com>
Subject: [PATCH 4/5] [SCTP]: IPv4 vs IPv6 addresses mess in sctp_inet[6]addr_event.

From: Pavel Emelyanov <xemul@...nvz.org>

All IP addresses that are present in a system are duplicated on
struct sctp_sockaddr_entry. They are linked in the global list
called sctp_local_addr_list. And this struct unions IPv4 and IPv6
addresses.

So, there can be rare case, when a sockaddr_in.sin_addr coincides
with the corresponding part of the sockaddr_in6 and the notifier
for IPv4 will carry away an IPv6 entry.

The fix is to check the family before comparing the addresses.

Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
---
 net/sctp/ipv6.c     |    5 +++--
 net/sctp/protocol.c |    4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index b1e05d7..85f1495 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -110,8 +110,9 @@ static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
 		spin_lock_bh(&sctp_local_addr_lock);
 		list_for_each_entry_safe(addr, temp,
 					&sctp_local_addr_list, list) {
-			if (ipv6_addr_equal(&addr->a.v6.sin6_addr,
-					     &ifa->addr)) {
+			if (addr->a.sa.sa_family == AF_INET6 &&
+					ipv6_addr_equal(&addr->a.v6.sin6_addr,
+						&ifa->addr)) {
 				found = 1;
 				addr->valid = 0;
 				list_del_rcu(&addr->list);
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index f90091a..c2dd65d 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -647,7 +647,9 @@ static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 		spin_lock_bh(&sctp_local_addr_lock);
 		list_for_each_entry_safe(addr, temp,
 					&sctp_local_addr_list, list) {
-			if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
+			if (addr->a.sa.sa_family == AF_INET &&
+					addr->a.v4.sin_addr.s_addr ==
+					ifa->ifa_local) {
 				found = 1;
 				addr->valid = 0;
 				list_del_rcu(&addr->list);
-- 
1.5.3.5

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