sch_teql: should not dereference skb after ndo_start_xmit()

It is illegal to dereference a skb after a successful ndo_start_xmit()
call. We must store skb length in a local variable instead.

Bug was introduced in 2.6.27 by commit 0abf77e55a2459aa9905be4b226e4729d5b4f0cb
(net_sched: Add accessor function for packet length for qdiscs)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index ec697ce..3b64182 100644 (file)
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -303,6 +303,8 @@ restart:
                switch (teql_resolve(skb, skb_res, slave)) {
                case 0:
                        if (__netif_tx_trylock(slave_txq)) {
+                               unsigned int length = qdisc_pkt_len(skb);
+
                                if (!netif_tx_queue_stopped(slave_txq) &&
                                    !netif_tx_queue_frozen(slave_txq) &&
                                    slave_ops->ndo_start_xmit(skb, slave) == 0) {
@@ -310,8 +312,7 @@ restart:
                                        master->slaves = NEXT_SLAVE(q);
                                        netif_wake_queue(dev);
                                        master->stats.tx_packets++;
-                                       master->stats.tx_bytes +=
-                                               qdisc_pkt_len(skb);
+                                       master->stats.tx_bytes += length;
                                        return 0;
                                }
                                __netif_tx_unlock(slave_txq);