From: Vlad Yasevich Date: Fri, 7 Dec 2007 06:50:27 +0000 (-0800) Subject: [SCTP]: Add bind hash locking to the migrate code X-Git-Tag: v2.6.24-rc5~52^2~3 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f26f7c480555812ca7c4037e0a50fa54afe2cb4a;p=linux-2.6 [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 Signed-off-by: David S. Miller --- diff --git a/net/sctp/socket.c b/net/sctp/socket.c index ff8bc95670..9f5d7930f5 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