[SRU][N][PATCH 6/6] codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

[Ian Whitfield]

From: Cong Wang <xiyou.wangcong at gmail.com>

After making all ->qlen_notify() callbacks idempotent, now it is safe to
remove the check of qlen!=0 from both fq_codel_dequeue() and
codel_qdisc_dequeue().

Reported-by: Gerrard Tai <gerrard.tai at starlabs.sg>
Fixes: 4b549a2ef4be ("fq_codel: Fair Queue Codel AQM")
Fixes: 76e3cc126bb2 ("codel: Controlled Delay AQM")
Signed-off-by: Cong Wang <xiyou.wangcong at gmail.com>
Reviewed-by: Simon Horman <horms at kernel.org>
Link: https://patch.msgid.link/20250403211636.166257-1-xiyou.wangcong@gmail.com
Acked-by: Jamal Hadi Salim <jhs at mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni at redhat.com>
(cherry picked from commit 342debc12183b51773b3345ba267e9263bdfaaef)
CVE-2025-37798
Signed-off-by: Ian Whitfield <ian.whitfield at canonical.com>
---
 net/sched/sch_codel.c    | 5 +----
 net/sched/sch_fq_codel.c | 6 ++----
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/net/sched/sch_codel.c b/net/sched/sch_codel.c
index d7a4874543de..5f2e06815745 100644
--- a/net/sched/sch_codel.c
+++ b/net/sched/sch_codel.c
@@ -95,10 +95,7 @@ static struct sk_buff *codel_qdisc_dequeue(struct Qdisc *sch)
 			    &q->stats, qdisc_pkt_len, codel_get_enqueue_time,
 			    drop_func, dequeue_func);
 
-	/* We cant call qdisc_tree_reduce_backlog() if our qlen is 0,
-	 * or HTB crashes. Defer it for next round.
-	 */
-	if (q->stats.drop_count && sch->q.qlen) {
+	if (q->stats.drop_count) {
 		qdisc_tree_reduce_backlog(sch, q->stats.drop_count, q->stats.drop_len);
 		q->stats.drop_count = 0;
 		q->stats.drop_len = 0;
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 8c4fee063436..9330923a624c 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -314,10 +314,8 @@ static struct sk_buff *fq_codel_dequeue(struct Qdisc *sch)
 	}
 	qdisc_bstats_update(sch, skb);
 	flow->deficit -= qdisc_pkt_len(skb);
-	/* We cant call qdisc_tree_reduce_backlog() if our qlen is 0,
-	 * or HTB crashes. Defer it for next round.
-	 */
-	if (q->cstats.drop_count && sch->q.qlen) {
+
+	if (q->cstats.drop_count) {
 		qdisc_tree_reduce_backlog(sch, q->cstats.drop_count,
 					  q->cstats.drop_len);
 		q->cstats.drop_count = 0;
-- 
2.43.0