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net: sched: Fix use after free in red_enqueue() #329

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Merged
merged 1 commit into from
Jun 10, 2025
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net: sched: Fix use after free in red_enqueue() #329

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4 changes: 3 additions & 1 deletion net/sched/sch_red.c
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,7 @@ 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,
Expand Down Expand Up @@ -130,9 +131,10 @@ 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++;
Expand Down