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[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>
This commit is contained in:
Vlad Yasevich 2007-12-06 22:50:27 -08:00 committed by David S. Miller
parent 56c99d0415
commit f26f7c4805
1 changed files with 6 additions and 0 deletions
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6
net/sctp/socket.c
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@ -6325,6 +6325,7 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
struct sctp_endpoint *newep = newsp->ep; struct sctp_endpoint *newep = newsp->ep;
struct sk_buff *skb, *tmp; struct sk_buff *skb, *tmp;
struct sctp_ulpevent *event; struct sctp_ulpevent *event;
struct sctp_bind_hashbucket *head;
int flags = 0; int flags = 0;
/* Migrate socket buffer sizes and all the socket level options to the /* 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; newsp->hmac = NULL;
/* Hook this new socket in to the bind_hash list. */ /* 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; pp = sctp_sk(oldsk)->bind_hash;
sk_add_bind_node(newsk, &pp->owner); sk_add_bind_node(newsk, &pp->owner);
sctp_sk(newsk)->bind_hash = pp; sctp_sk(newsk)->bind_hash = pp;
inet_sk(newsk)->num = inet_sk(oldsk)->num; 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 /* Copy the bind_addr list from the original endpoint to the new
* endpoint so that we can handle restarts properly * endpoint so that we can handle restarts properly