netdev - [PATCH net-next v2 1/1] net/sched: We should only add appropriate qdiscs blocks to ports' xarray

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Date: Sun, 31 Dec 2023 14:23:20 -0300
From: Victor Nogueira <victor@...atatu.com>
To: jhs@...atatu.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us
Cc: idosch@...sch.org,
	mleitner@...hat.com,
	vladbu@...dia.com,
	paulb@...dia.com,
	pctammela@...atatu.com,
	netdev@...r.kernel.org,
	kernel@...atatu.com,
	syzbot+84339b9e7330daae4d66@...kaller.appspotmail.com,
	syzbot+806b0572c8d06b66b234@...kaller.appspotmail.com,
	syzbot+0039110f932d438130f9@...kaller.appspotmail.com
Subject: [PATCH net-next v2 1/1] net/sched: We should only add appropriate qdiscs blocks to ports' xarray

We should only add qdiscs to the blocks ports' xarray in ingress that
support ingress_block_set/get or in egress that support
egress_block_set/get.

Fixes: 913b47d3424e ("net/sched: Introduce tc block netdev tracking infra")
Signed-off-by: Victor Nogueira <victor@...atatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
Reported-by: Ido Schimmel <idosch@...dia.com>
Closes: https://lore.kernel.org/all/ZY1hBb8GFwycfgvd@shredder/
Tested-by: Ido Schimmel <idosch@...dia.com>
Reported-and-tested-by: syzbot+84339b9e7330daae4d66@...kaller.appspotmail.com
Closes: https://lore.kernel.org/all/0000000000007c85f5060dcc3a28@google.com/
Reported-and-tested-by: syzbot+806b0572c8d06b66b234@...kaller.appspotmail.com
Closes: https://lore.kernel.org/all/00000000000082f2f2060dcc3a92@google.com/
Reported-and-tested-by: syzbot+0039110f932d438130f9@...kaller.appspotmail.com
Closes: https://lore.kernel.org/all/0000000000007fbc8c060dcc3a5c@google.com/
---
v1 -> v2:

- Remove newline between fixes tag and Signed-off-by tag
- Add Ido's Reported-by and Tested-by tags
- Add syzbot's Reported-and-tested-by tags

 net/sched/sch_api.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 299086bb6205..426be81276f1 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1187,23 +1187,29 @@ static int qdisc_block_add_dev(struct Qdisc *sch, struct net_device *dev,
 	struct tcf_block *block;
 	int err;
 
-	block = cl_ops->tcf_block(sch, TC_H_MIN_INGRESS, NULL);
-	if (block) {
-		err = xa_insert(&block->ports, dev->ifindex, dev, GFP_KERNEL);
-		if (err) {
-			NL_SET_ERR_MSG(extack,
-				       "ingress block dev insert failed");
-			return err;
+	if (sch->ops->ingress_block_get) {
+		block = cl_ops->tcf_block(sch, TC_H_MIN_INGRESS, NULL);
+		if (block) {
+			err = xa_insert(&block->ports, dev->ifindex, dev,
+					GFP_KERNEL);
+			if (err) {
+				NL_SET_ERR_MSG(extack,
+					       "ingress block dev insert failed");
+				return err;
+			}
 		}
 	}
 
-	block = cl_ops->tcf_block(sch, TC_H_MIN_EGRESS, NULL);
-	if (block) {
-		err = xa_insert(&block->ports, dev->ifindex, dev, GFP_KERNEL);
-		if (err) {
-			NL_SET_ERR_MSG(extack,
-				       "Egress block dev insert failed");
-			goto err_out;
+	if (sch->ops->egress_block_get) {
+		block = cl_ops->tcf_block(sch, TC_H_MIN_EGRESS, NULL);
+		if (block) {
+			err = xa_insert(&block->ports, dev->ifindex, dev,
+					GFP_KERNEL);
+			if (err) {
+				NL_SET_ERR_MSG(extack,
+					       "Egress block dev insert failed");
+				goto err_out;
+			}
 		}
 	}
 
-- 
2.25.1