x

src/core/tsi/fake_transport_security.cc

@@ -191,6 +191,10 @@ static tsi_result tsi_fake_frame_decode(const unsigned char* incoming_bytes,
     frame->allocated_size = TSI_FAKE_FRAME_INITIAL_ALLOCATED_SIZE;
     frame->data =
         static_cast<unsigned char*>(gpr_malloc(frame->allocated_size));
+    // Initialize `data` to some recognizably bad values.
+    // There's some debug code paths where we stringify the entire buffer, and
+    // doing so leads to ubsan failures on those code paths -- which are
+    // commonly hit using fuzzers.
     memset(frame->data, 0xab, frame->allocated_size);
   }