Avoid crash in ebpf backend by checking expected IR node kinds (#3427)

Signed-off-by: Mihai Budiu <[email protected]>
p4lang · Jul 9, 2022 · c770c95 · c770c95
1 parent 9b88fdb
commit c770c95
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/backends/ebpf/psa/ebpfPipeline.cpp b/backends/ebpf/psa/ebpfPipeline.cpp
@@ -27,8 +27,10 @@ bool EBPFPipeline::isEmpty() const {
     }
 
     auto startState = parser->parserBlock->container->states.at(0);
-    auto pathExpr = startState->selectExpression->to<IR::PathExpression>()->path;
-    if (!startState->components.empty() || pathExpr->name.name != IR::ParserState::accept) {
+    auto path = startState->selectExpression->to<IR::PathExpression>();
+    if (!path)
+        return false;
+    if (!startState->components.empty() || path->path->name.name != IR::ParserState::accept) {
         return false;
     }