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[SCTP]: Fix local_addr deletions during list traversals.

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Since the lists are circular, we need to explicitely tag
the address to be deleted since we might end up freeing
the list head instead.  This fixes some interesting SCTP
crashes.

Signed-off-by: Chidambar 'ilLogict' Zinnoury <illogict@online.fr>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chidambar 'ilLogict' Zinnoury 2008-03-11 18:05:02 -07:00 • committed by David S. Miller
parent b2211a361a
commit 22626216c4
3 changed files with 9 additions and 3 deletions
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4
net/sctp/protocol.c
View file

@ -628,6 +628,7 @@ static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
struct sctp_sockaddr_entry *addr = NULL;
struct sctp_sockaddr_entry *temp;
int found = 0;
switch (ev) {
case NETDEV_UP:
@ -647,13 +648,14 @@ static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
list_for_each_entry_safe(addr, temp,
&sctp_local_addr_list, list) {
if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
found = 1;
addr->valid = 0;
list_del_rcu(&addr->list);
break;
}
}
spin_unlock_bh(&sctp_local_addr_lock);
if (addr && !addr->valid)
if (found)
call_rcu(&addr->rcu, sctp_local_addr_free);
break;
}