commit 746b23e44e933a993777eb054ab6b44724a43d6e
Author: Chidambar 'ilLogict' Zinnoury <[EMAIL PROTECTED]>
Date: Sun Apr 6 23:42:35 2008 -0700
SCTP: Fix local_addr deletions during list traversals.
Upstream commit: 22626216c46f2ec86287e75ea86dd9ac3df54265
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 <[EMAIL PROTECTED]>
Signed-off-by: Vlad Yasevich <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index 6a7d010..a98c003 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -209,6 +209,7 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union
sctp_addr *new,
int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
{
struct sctp_sockaddr_entry *addr, *temp;
+ int found = 0;
/* We hold the socket lock when calling this function,
* and that acts as a writer synchronizing lock.
@@ -216,13 +217,14 @@ int sctp_del_bind_addr(struct sctp_bind_addr *bp, union
sctp_addr *del_addr)
list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
/* Found the exact match. */
+ found = 1;
addr->valid = 0;
list_del_rcu(&addr->list);
break;
}
}
- if (addr && !addr->valid) {
+ if (found) {
call_rcu(&addr->rcu, sctp_local_addr_free);
SCTP_DBG_OBJCNT_DEC(addr);
return 0;
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 7f31ff6..1eaa1b5 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -89,6 +89,7 @@ static int sctp_inet6addr_event(struct notifier_block *this,
unsigned long ev,
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct sctp_sockaddr_entry *addr = NULL;
struct sctp_sockaddr_entry *temp;
+ int found = 0;
switch (ev) {
case NETDEV_UP:
@@ -111,13 +112,14 @@ static int sctp_inet6addr_event(struct notifier_block
*this, unsigned long ev,
&sctp_local_addr_list, list) {
if (ipv6_addr_equal(&addr->a.v6.sin6_addr,
&ifa->addr)) {
+ 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;
}
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index d50f610..022adbd 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -626,6 +626,7 @@ 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:
@@ -645,13 +646,14 @@ 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;
}
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