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| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2007-12-06 22:50:27 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-12-07 01:07:45 -0800 |
| commit | f26f7c480555812ca7c4037e0a50fa54afe2cb4a (patch) | |
| tree | 1418b99033d50241b8f866124b0974e7adb16449 | |
| parent | 56c99d0415e8b778c200f115b198c126243ec351 (diff) | |
| download | op-kernel-dev-f26f7c480555812ca7c4037e0a50fa54afe2cb4a.zip op-kernel-dev-f26f7c480555812ca7c4037e0a50fa54afe2cb4a.tar.gz | |
[SCTP]: Add bind hash locking to the migrate code
SCTP accept code tries to add a newliy created socket
to a bind bucket without holding a lock. On a really
busy system, that can causes slab corruptions.
Add a lock around this code.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sctp/socket.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index ff8bc95..9f5d793 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -6325,6 +6325,7 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk, struct sctp_endpoint *newep = newsp->ep; struct sk_buff *skb, *tmp; struct sctp_ulpevent *event; + struct sctp_bind_hashbucket *head; int flags = 0; /* Migrate socket buffer sizes and all the socket level options to the @@ -6342,10 +6343,15 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk, newsp->hmac = NULL; /* Hook this new socket in to the bind_hash list. */ + head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->num)]; + sctp_local_bh_disable(); + sctp_spin_lock(&head->lock); pp = sctp_sk(oldsk)->bind_hash; sk_add_bind_node(newsk, &pp->owner); sctp_sk(newsk)->bind_hash = pp; inet_sk(newsk)->num = inet_sk(oldsk)->num; + sctp_spin_unlock(&head->lock); + sctp_local_bh_enable(); /* Copy the bind_addr list from the original endpoint to the new * endpoint so that we can handle restarts properly |
