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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