[NETFILTER]: nf_conntrack_sctp: don't take sctp_lock once per chunk

Don't take and release the lock once per SCTP chunk, simply hold it
the entire time while iterating through the chunks.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 7baabc045342..177e8f60aa1c 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -325,9 +325,8 @@ static int sctp_packet(struct nf_conn *ct,
         }
 
         old_state = new_state = SCTP_CONNTRACK_MAX;
+        write_lock_bh(&sctp_lock);
         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
-                write_lock_bh(&sctp_lock);
-
                 /* Special cases of Verification tag check (Sec 8.5.1) */
                 if (sch->type == SCTP_CID_INIT) {
                         /* Sec 8.5.1 (A) */
@@ -378,8 +377,8 @@ static int sctp_packet(struct nf_conn *ct,
                 ct->proto.sctp.state = new_state;
                 if (old_state != new_state)
                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
-                write_unlock_bh(&sctp_lock);
         }
+        write_unlock_bh(&sctp_lock);
 
         nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[new_state]);