netdev - [PATCH net v2 1/5] net: sched: cls_bpf: Undo tcf_bind

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Date: Wed,  5 Jul 2023 10:43:25 -0300
From: Victor Nogueira <victor@...atatu.com>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pctammela@...atatu.com,
	simon.horman@...igine.com,
	kernel@...atatu.com
Subject: [PATCH net v2 1/5] net: sched: cls_bpf: Undo tcf_bind_filter in case of an error

If cls_bpf_offload errors out, we must also undo tcf_bind_filter that
was done in cls_bpf_set_parms.

Fix that by calling tcf_unbind_filter in errout_parms.

Fixes: eadb41489fd2 ("net: cls_bpf: add support for marking filters as hardware-only")
Signed-off-by: Victor Nogueira <victor@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
---
 net/sched/cls_bpf.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 466c26df853a..c45321fb3a5e 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -409,7 +409,7 @@ static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
 			     struct cls_bpf_prog *prog, unsigned long base,
 			     struct nlattr **tb, struct nlattr *est, u32 flags,
-			     struct netlink_ext_ack *extack)
+			     bool *bound_to_filter, struct netlink_ext_ack *extack)
 {
 	bool is_bpf, is_ebpf, have_exts = false;
 	u32 gen_flags = 0;
@@ -451,6 +451,7 @@ static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
 	if (tb[TCA_BPF_CLASSID]) {
 		prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
 		tcf_bind_filter(tp, &prog->res, base);
+		*bound_to_filter = true;
 	}
 
 	return 0;
@@ -465,6 +466,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 	struct cls_bpf_head *head = rtnl_dereference(tp->root);
 	struct cls_bpf_prog *oldprog = *arg;
 	struct nlattr *tb[TCA_BPF_MAX + 1];
+	bool bound_to_filter = false;
 	struct cls_bpf_prog *prog;
 	int ret;
 
@@ -505,7 +507,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 	prog->handle = handle;
 
 	ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], flags,
-				extack);
+				&bound_to_filter, extack);
 	if (ret < 0)
 		goto errout_idr;
 
@@ -530,6 +532,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 	return 0;
 
 errout_parms:
+	if (bound_to_filter)
+		tcf_unbind_filter(tp, &prog->res);
 	cls_bpf_free_parms(prog);
 errout_idr:
 	if (!oldprog)
-- 
2.25.1