Patch "net/sched: act_mpls: fix action bind logic" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    net/sched: act_mpls: fix action bind logic

to the 6.2-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-act_mpls-fix-action-bind-logic.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit bc9f27cc71b9d1035689fc224efa3f8b5cf5a51b
Author: Pedro Tammela <pctammela@xxxxxxxxxxxx>
Date:   Fri Feb 24 12:00:57 2023 -0300

    net/sched: act_mpls: fix action bind logic
    
    [ Upstream commit e88d78a773cb5242e933930c8855bf4b2e8c2397 ]
    
    The TC architecture allows filters and actions to be created independently.
    In filters the user can reference action objects using:
    tc action add action mpls ... index 1
    tc filter add ... action mpls index 1
    
    In the current code for act_mpls this is broken as it checks netlink
    attributes for create/update before actually checking if we are binding to an
    existing action.
    
    tdc results:
    1..53
    ok 1 a933 - Add MPLS dec_ttl action with pipe opcode
    ok 2 08d1 - Add mpls dec_ttl action with pass opcode
    ok 3 d786 - Add mpls dec_ttl action with drop opcode
    ok 4 f334 - Add mpls dec_ttl action with reclassify opcode
    ok 5 29bd - Add mpls dec_ttl action with continue opcode
    ok 6 48df - Add mpls dec_ttl action with jump opcode
    ok 7 62eb - Add mpls dec_ttl action with trap opcode
    ok 8 09d2 - Add mpls dec_ttl action with opcode and cookie
    ok 9 c170 - Add mpls dec_ttl action with opcode and cookie of max length
    ok 10 9118 - Add mpls dec_ttl action with invalid opcode
    ok 11 6ce1 - Add mpls dec_ttl action with label (invalid)
    ok 12 352f - Add mpls dec_ttl action with tc (invalid)
    ok 13 fa1c - Add mpls dec_ttl action with ttl (invalid)
    ok 14 6b79 - Add mpls dec_ttl action with bos (invalid)
    ok 15 d4c4 - Add mpls pop action with ip proto
    ok 16 91fb - Add mpls pop action with ip proto and cookie
    ok 17 92fe - Add mpls pop action with mpls proto
    ok 18 7e23 - Add mpls pop action with no protocol (invalid)
    ok 19 6182 - Add mpls pop action with label (invalid)
    ok 20 6475 - Add mpls pop action with tc (invalid)
    ok 21 067b - Add mpls pop action with ttl (invalid)
    ok 22 7316 - Add mpls pop action with bos (invalid)
    ok 23 38cc - Add mpls push action with label
    ok 24 c281 - Add mpls push action with mpls_mc protocol
    ok 25 5db4 - Add mpls push action with label, tc and ttl
    ok 26 7c34 - Add mpls push action with label, tc ttl and cookie of max length
    ok 27 16eb - Add mpls push action with label and bos
    ok 28 d69d - Add mpls push action with no label (invalid)
    ok 29 e8e4 - Add mpls push action with ipv4 protocol (invalid)
    ok 30 ecd0 - Add mpls push action with out of range label (invalid)
    ok 31 d303 - Add mpls push action with out of range tc (invalid)
    ok 32 fd6e - Add mpls push action with ttl of 0 (invalid)
    ok 33 19e9 - Add mpls mod action with mpls label
    ok 34 1fde - Add mpls mod action with max mpls label
    ok 35 0c50 - Add mpls mod action with mpls label exceeding max (invalid)
    ok 36 10b6 - Add mpls mod action with mpls label of MPLS_LABEL_IMPLNULL (invalid)
    ok 37 57c9 - Add mpls mod action with mpls min tc
    ok 38 6872 - Add mpls mod action with mpls max tc
    ok 39 a70a - Add mpls mod action with mpls tc exceeding max (invalid)
    ok 40 6ed5 - Add mpls mod action with mpls ttl
    ok 41 77c1 - Add mpls mod action with mpls ttl and cookie
    ok 42 b80f - Add mpls mod action with mpls max ttl
    ok 43 8864 - Add mpls mod action with mpls min ttl
    ok 44 6c06 - Add mpls mod action with mpls ttl of 0 (invalid)
    ok 45 b5d8 - Add mpls mod action with mpls ttl exceeding max (invalid)
    ok 46 451f - Add mpls mod action with mpls max bos
    ok 47 a1ed - Add mpls mod action with mpls min bos
    ok 48 3dcf - Add mpls mod action with mpls bos exceeding max (invalid)
    ok 49 db7c - Add mpls mod action with protocol (invalid)
    ok 50 b070 - Replace existing mpls push action with new ID
    ok 51 95a9 - Replace existing mpls push action with new label, tc, ttl and cookie
    ok 52 6cce - Delete mpls pop action
    ok 53 d138 - Flush mpls actions
    
    Fixes: 2a2ea50870ba ("net: sched: add mpls manipulation actions to TC")
    Reviewed-by: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
    Signed-off-by: Pedro Tammela <pctammela@xxxxxxxxxxxx>
    Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
index 6b26bdb999d77..809f7928a1be6 100644
--- a/net/sched/act_mpls.c
+++ b/net/sched/act_mpls.c
@@ -190,40 +190,67 @@ static int tcf_mpls_init(struct net *net, struct nlattr *nla,
 	parm = nla_data(tb[TCA_MPLS_PARMS]);
 	index = parm->index;
 
+	err = tcf_idr_check_alloc(tn, &index, a, bind);
+	if (err < 0)
+		return err;
+	exists = err;
+	if (exists && bind)
+		return 0;
+
+	if (!exists) {
+		ret = tcf_idr_create(tn, index, est, a, &act_mpls_ops, bind,
+				     true, flags);
+		if (ret) {
+			tcf_idr_cleanup(tn, index);
+			return ret;
+		}
+
+		ret = ACT_P_CREATED;
+	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+		tcf_idr_release(*a, bind);
+		return -EEXIST;
+	}
+
 	/* Verify parameters against action type. */
 	switch (parm->m_action) {
 	case TCA_MPLS_ACT_POP:
 		if (!tb[TCA_MPLS_PROTO]) {
 			NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
 			NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] ||
 		    tb[TCA_MPLS_BOS]) {
 			NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		break;
 	case TCA_MPLS_ACT_DEC_TTL:
 		if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] ||
 		    tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) {
 			NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		break;
 	case TCA_MPLS_ACT_PUSH:
 	case TCA_MPLS_ACT_MAC_PUSH:
 		if (!tb[TCA_MPLS_LABEL]) {
 			NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		if (tb[TCA_MPLS_PROTO] &&
 		    !eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
 			NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
-			return -EPROTONOSUPPORT;
+			err = -EPROTONOSUPPORT;
+			goto release_idr;
 		}
 		/* Push needs a TTL - if not specified, set a default value. */
 		if (!tb[TCA_MPLS_TTL]) {
@@ -238,33 +265,14 @@ static int tcf_mpls_init(struct net *net, struct nlattr *nla,
 	case TCA_MPLS_ACT_MODIFY:
 		if (tb[TCA_MPLS_PROTO]) {
 			NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
-			return -EINVAL;
+			err = -EINVAL;
+			goto release_idr;
 		}
 		break;
 	default:
 		NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
-		return -EINVAL;
-	}
-
-	err = tcf_idr_check_alloc(tn, &index, a, bind);
-	if (err < 0)
-		return err;
-	exists = err;
-	if (exists && bind)
-		return 0;
-
-	if (!exists) {
-		ret = tcf_idr_create(tn, index, est, a,
-				     &act_mpls_ops, bind, true, flags);
-		if (ret) {
-			tcf_idr_cleanup(tn, index);
-			return ret;
-		}
-
-		ret = ACT_P_CREATED;
-	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
-		tcf_idr_release(*a, bind);
-		return -EEXIST;
+		err = -EINVAL;
+		goto release_idr;
 	}
 
 	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);



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