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[SCTP]: IPv4 vs IPv6 addresses mess in sctp_inet[6]addr_event. 

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@openvz.org>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-04-12 18:40:38 -07:00 committed by David S. Miller
parent ab38fb04c9
commit a40a7d15ba
2 changed files with 6 additions and 3 deletions
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5
net/sctp/ipv6.c
View File

@ -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);

4
net/sctp/protocol.c
View File

@ -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);