[PATCH 5.4 141/154] net_sched: skbprio: Remove overly strict queue assertions

Greg Kroah-Hartman
2025-04-08T12:08:36Z

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

[ Upstream commit ce8fe975fd99b49c29c42e50f2441ba53112b2e8 ]

In the current implementation, skbprio enqueue/dequeue contains an assertion
that fails under certain conditions when SKBPRIO is used as a child qdisc under
TBF with specific parameters. The failure occurs because TBF sometimes peeks at
packets in the child qdisc without actually dequeuing them when tokens are
unavailable.

This peek operation creates a discrepancy between the parent and child qdisc
queue length counters. When TBF later receives a high-priority packet,
SKBPRIO's queue length may show a different value than what's reflected in its
internal priority queue tracking, triggering the assertion.

The fix removes this overly strict assertions in SKBPRIO, they are not
necessary at all.

Reported-by: syzbot+a3422a19b05ea96bee18@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=a3422a19b05ea96bee18
Fixes: aea5f654e6b7 ("net/sched: add skbprio scheduler")
Cc: Nishanth Devarajan <ndev2021@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://patch.msgid.link/20250329222536.696204-2-xiyou.wangcong@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sched/sch_skbprio.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/net/sched/sch_skbprio.c b/net/sched/sch_skbprio.c
index 7a5e4c4547156..7dca66026ca4d 100644
--- a/net/sched/sch_skbprio.c
+++ b/net/sched/sch_skbprio.c
@@ -121,8 +121,6 @@ static int skbprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
/* Check to update highest and lowest priorities. */
if (skb_queue_empty(lp_qdisc)) {
if (q->lowest_prio == q->highest_prio) {
- /* The incoming packet is the only packet in queue. */
- BUG_ON(sch->q.qlen != 1);
q->lowest_prio = prio;
q->highest_prio = prio;
} else {
@@ -154,7 +152,6 @@ static struct sk_buff *skbprio_dequeue(struct Qdisc *sch)
/* Update highest priority field. */
if (skb_queue_empty(hpq)) {
if (q->lowest_prio == q->highest_prio) {
- BUG_ON(sch->q.qlen);
q->highest_prio = 0;
q->lowest_prio = SKBPRIO_MAX_PRIORITY - 1;
} else {
--
2.39.5