[ 12/54] netem: fix possible skb leak

From: Greg KH
Date: Fri May 18 2012 - 19:32:28 EST


3.0-stable review patch. If anyone has any objections, please let me know.

------------------


From: Eric Dumazet <edumazet@xxxxxxxxxx>

[ Upstream commit 116a0fc31c6c9b8fc821be5a96e5bf0b43260131 ]

skb_checksum_help(skb) can return an error, we must free skb in this
case. qdisc_drop(skb, sch) can also be feeded with a NULL skb (if
skb_unshare() failed), so lets use this generic helper.

Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Stephen Hemminger <shemminger@xxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/sch_netem.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -350,10 +350,8 @@ static int netem_enqueue(struct sk_buff
if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) {
if (!(skb = skb_unshare(skb, GFP_ATOMIC)) ||
(skb->ip_summed == CHECKSUM_PARTIAL &&
- skb_checksum_help(skb))) {
- sch->qstats.drops++;
- return NET_XMIT_DROP;
- }
+ skb_checksum_help(skb)))
+ return qdisc_drop(skb, sch);

skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8);
}


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