Messages in this thread Patch in this message | | | Date | Wed, 16 Apr 2008 18:02:00 -0700 | From | Chris Wright <> | Subject | SCTP: Fix local_addr deletions during list traversals. |
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-stable review patch. If anyone has any objections, please let us know. ---------------------
From: Chidambar 'ilLogict' Zinnoury <illogict@online.fr>
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 <illogict@online.fr> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Chris Wright <chrisw@sous-sol.org> --- net/sctp/bind_addr.c | 4 +++- net/sctp/ipv6.c | 4 +++- net/sctp/protocol.c | 4 +++- 3 files changed, 9 insertions(+), 3 deletions(-)
--- a/net/sctp/bind_addr.c +++ b/net/sctp/bind_addr.c @@ -209,6 +209,7 @@ int sctp_add_bind_addr(struct sctp_bind_ 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_ 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; --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -89,6 +89,7 @@ static int sctp_inet6addr_event(struct n 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 n &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; } --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -626,6 +626,7 @@ static int sctp_inetaddr_event(struct no 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 no 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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