Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f26f7c...
Commit:     f26f7c480555812ca7c4037e0a50fa54afe2cb4a
Parent:     56c99d0415e8b778c200f115b198c126243ec351
Author:     Vlad Yasevich <vladislav.yasevich@hp.com>
AuthorDate: Thu Dec 6 22:50:27 2007 -0800
Committer:  David S. Miller <davem@sunset.davemloft.net>
CommitDate: Fri Dec 7 01:07:45 2007 -0800

    [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>
---
 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
-
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