Fix perf_submit() calls with array data crashing libbcc

A perf_submit() call like: unsigned char buf[16] = ...; output.perf_submit(ctx, buf, sizeof(buf)); Passes a non-pointer arg1, so getPointeeType().getTypePtr() is invalid, and crashes libbcc. Use getTypePtrOrNull() instead to avoid it. Signed-off-by: Yonatan Goldschmidt <[email protected]>
drcwr · Dec 29, 2020 · 9541149 · 9541149
1 parent 8fac710
commit 9541149
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/cc/frontends/clang/b_frontend_action.cc b/src/cc/frontends/clang/b_frontend_action.cc
@@ -925,8 +925,8 @@ bool BTypeVisitor::VisitCallExpr(CallExpr *Call) {
  // events.perf_submit(ctx, &data, sizeof(data));
  // ...
  // &data -> data -> typeof(data) -> data_t
- auto type_arg1 = Call->getArg(1)->IgnoreCasts()->getType().getTypePtr()->getPointeeType().getTypePtr();
- if (type_arg1->isStructureType()) {
+ auto type_arg1 = Call->getArg(1)->IgnoreCasts()->getType().getTypePtr()->getPointeeType().getTypePtrOrNull();
+ if (type_arg1 && type_arg1->isStructureType()) {
  auto event_type = type_arg1->getAsTagDecl();
  const auto *r = dyn_cast<RecordDecl>(event_type);
  std::vector<std::string> perf_event;