fatal: cannot run /usr/local/google/home/vmiura/bin/query-watchman: No such file or directory
fatal: cannot run /usr/local/google/home/vmiura/bin/query-watchman: No such file or directory
diff --git a/media/mojo/services/mojo_decryptor_service.cc b/media/mojo/services/mojo_decryptor_service.cc
index 0476042c20daf..98dc00787b0ed 100644
--- a/media/mojo/services/mojo_decryptor_service.cc
+++ b/media/mojo/services/mojo_decryptor_service.cc
@@ -125,6 +125,18 @@ void MojoDecryptorService::InitializeVideoDecoder(
     const VideoDecoderConfig& config,
     InitializeVideoDecoderCallback callback) {
   DVLOG(2) << __func__;
+
+  // Commit 36ab3814f2c58 removed IsValidConfig() from the
+  // VideoDecoderConfig mojom trait and moved it to consumers, but missed
+  // this consumer. Restore the check that previously protected the library
+  // CDM (CdmAdapter -> closed-source binary) from out-of-spec coded_size.
+  // Mirrors mojo_video_decoder_service.cc:257-263.
+  if (!config.IsValidConfig()) {
+    std::move(callback).Run(false);
+    mojo::ReportBadMessage("Invalid VideoDecoderConfig");
+    return;
+  }
+
   decryptor_->InitializeVideoDecoder(
       config, base::BindOnce(&MojoDecryptorService::OnVideoDecoderInitialized,
                              weak_this_, std::move(callback)));