Add tdc test cases that verify a qdisc with an oversized TCA_STAB
overhead (2147483000) is rejected. Without the fix, the qdisc is
accepted and a single packet drives the deficit loop into a soft
lockup; with the fix, the add fails with -EINVAL.

Reported-by: vega@nebusec.ai
Tested-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
---
 .../tc-testing/tc-tests/qdiscs/drr.json       | 20 +++++++++++++++++++
 .../tc-testing/tc-tests/qdiscs/ets.json       | 20 +++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/drr.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/drr.json
index 2b61d8d79bde..7713eb35aaeb 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/drr.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/drr.json
@@ -86,5 +86,25 @@
         "teardown": [
             "$TC qdisc del dev $DUMMY root"
         ]
+    },
+    {
+        "id": "d1e2",
+        "name": "Reject DRR qdisc with oversized TCA_STAB overhead",
+        "category": [
+            "qdisc",
+            "drr"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+        ],
+        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root stab overhead 2147483000 drr",
+        "expExitCode": "2",
+        "verifyCmd": "$TC qdisc show dev $DUMMY",
+        "matchPattern": "qdisc drr",
+        "matchCount": "0",
+        "teardown": [
+        ]
     }
 ]
diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
index ee09e6d6fdf3..da7ae626f7e1 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
@@ -1007,5 +1007,25 @@
         "teardown": [
             "echo \"1\" > /sys/bus/netdevsim/del_device"
         ]
+    },
+    {
+        "id": "f3a4",
+        "name": "Reject ETS qdisc with oversized TCA_STAB overhead",
+        "category": [
+            "qdisc",
+            "ets"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+        ],
+        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root stab overhead 2147483000 ets bands 1 strict 0 quanta 1",
+        "expExitCode": "2",
+        "verifyCmd": "$TC qdisc show dev $DUMMY",
+        "matchPattern": "qdisc ets",
+        "matchCount": "0",
+        "teardown": [
+        ]
     }
 ]
-- 
2.43.0