From: Chidambar 'ilLogict' Zinnoury <illogict@online.fr>
Date: Wed, 12 Mar 2008 01:05:02 +0000 (-0700)
Subject: [SCTP]: Fix local_addr deletions during list traversals.
X-Git-Tag: v2.6.25-rc6~31^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22626216c46f2ec86287e75ea86dd9ac3df54265;p=linux-2.6

[SCTP]: Fix local_addr deletions during list traversals.

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>
---

diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index a27511ebc4..ceefda025e 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 87f940587d..9aa0733aee 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 688546dccd..ad0a4069b9 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -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;
 	}