sctp: sctp_remaddr_seq_show use the wrong variable to dump transport info

Now in sctp_remaddr_seq_show(), we use variable *tsp to get the param *v.
but *tsp is also used to traversal transport_addr_list, which will cover
the previous value, and make sctp_transport_put work on the wrong transport.

So fix it by adding a new variable to get the param *v.

Fixes: fba4c330c5b9 ("sctp: hold transport before we access t->asoc in sctp proc")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index ded7d93..963dffc 100644 (file)
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -482,7 +482,7 @@ static void sctp_remaddr_seq_stop(struct seq_file *seq, void *v)
 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
 {
        struct sctp_association *assoc;
-       struct sctp_transport *tsp;
+       struct sctp_transport *transport, *tsp;
 
        if (v == SEQ_START_TOKEN) {
                seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
@@ -490,10 +490,10 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
                return 0;
        }
 
-       tsp = (struct sctp_transport *)v;
-       if (!sctp_transport_hold(tsp))
+       transport = (struct sctp_transport *)v;
+       if (!sctp_transport_hold(transport))
                return 0;
-       assoc = tsp->asoc;
+       assoc = transport->asoc;
 
        list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
                                transports) {
@@ -546,7 +546,7 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
                seq_printf(seq, "\n");
        }
 
-       sctp_transport_put(tsp);
+       sctp_transport_put(transport);
 
        return 0;
 }