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net: sched: Fix use after free in red_enqueue()

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[ Upstream commit 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9 ]

We can't use "skb" again after passing it to qdisc_enqueue().  This is
basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb
len before calling child enqueue").

Fixes: d7f4f332f082 ("sch_red: update backlog as well")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2022-10-28 18:05:00 +03:00 committed by Greg Kroah-Hartman
parent e4b7e0dcd1
commit 795afe0b9b
1 changed files with 3 additions and 1 deletions
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4
net/sched/sch_red.c
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@ -61,6 +61,7 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
{
struct red_sched_data *q = qdisc_priv(sch);
struct Qdisc *child = q->qdisc;
unsigned int len;
int ret;
q->vars.qavg = red_calc_qavg(&q->parms,
@ -96,9 +97,10 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
break;
}
len = qdisc_pkt_len(skb);
ret = qdisc_enqueue(skb, child, to_free);
if (likely(ret == NET_XMIT_SUCCESS)) {
qdisc_qstats_backlog_inc(sch, skb);
sch->qstats.backlog += len;
sch->q.qlen++;
} else if (net_xmit_drop_count(ret)) {
q->stats.pdrop++;