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authorEric Dumazet <dada1@cosmosbay.com>2009-05-18 15:12:31 -0700
committerDavid S. Miller <davem@davemloft.net>2009-05-18 15:12:31 -0700
commitc0f84d0d4be3f7d818b4ffb04d27f9bae64397f0 (patch)
treee36a3f3e2d5cdbc9dfdbd2c5dd4857d93d8776b9
parent775273131810caa41dfc7f9e552ea5d8508caf40 (diff)
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>
-rw-r--r--net/sched/sch_teql.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index ec697cebb63..3b641829723 100644
--- 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);