This is a note to let you know that I've just added the patch titled
net/sched: sch_qfq: reintroduce lmax bound check for MTU
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-sched-sch_qfq-reintroduce-lmax-bound-check-for-m.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 995657ed88cb063b7ecfad81292ee1ca3ae6f64e
Author: Pedro Tammela <pctammela@xxxxxxxxxxxx>
Date: Tue Jul 11 18:01:00 2023 -0300
net/sched: sch_qfq: reintroduce lmax bound check for MTU
[ Upstream commit 158810b261d02fc7dd92ca9c392d8f8a211a2401 ]
25369891fcef deletes a check for the case where no 'lmax' is
specified which 3037933448f6 previously fixed as 'lmax'
could be set to the device's MTU without any bound checking
for QFQ_LMAX_MIN and QFQ_LMAX_MAX. Therefore, reintroduce the check.
Fixes: 25369891fcef ("net/sched: sch_qfq: refactor parsing of netlink parameters")
Acked-by: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Pedro Tammela <pctammela@xxxxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index dfd9a99e62570..63a5b277c117f 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -423,10 +423,17 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
else
weight = 1;
- if (tb[TCA_QFQ_LMAX])
+ if (tb[TCA_QFQ_LMAX]) {
lmax = nla_get_u32(tb[TCA_QFQ_LMAX]);
- else
+ } else {
+ /* MTU size is user controlled */
lmax = psched_mtu(qdisc_dev(sch));
+ if (lmax < QFQ_MIN_LMAX || lmax > QFQ_MAX_LMAX) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "MTU size out of bounds for qfq");
+ return -EINVAL;
+ }
+ }
inv_w = ONE_FP / weight;
weight = ONE_FP / inv_w;
