From f58d0b56e37aa6a85848618018d7a17b86746bc0 Mon Sep 17 00:00:00 2001
From: Protobuf Team Bot <protobuf-github-bot@google.com>
Date: Tue, 7 Feb 2023 14:20:19 -0800
Subject: [PATCH] Initialize variable that is detected as 'maybe
 uninitialized'.

With gcc (tested versions: 11.3.0, 12.2.0) compiled with asan, the
`type_id` variable is warned about maybe being used uninitialized in
the later call:

```
 ptr = ParseFieldMaybeLazily(static_cast<uint64_t(type_id) * 8 + 2, ptr,
                             extendee, metadata, ctx);
```

This change initializes the variable to a defined default.

PiperOrigin-RevId: 507883964
---
 src/google/protobuf/extension_set_inl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/google/protobuf/extension_set_inl.h b/src/google/protobuf/extension_set_inl.h
index f7dc8300fd..bd01e95044 100644
--- a/src/google/protobuf/extension_set_inl.h
+++ b/src/google/protobuf/extension_set_inl.h
@@ -206,7 +206,7 @@ const char* ExtensionSet::ParseMessageSetItemTmpl(
     const char* ptr, const Msg* extendee, internal::InternalMetadata* metadata,
     internal::ParseContext* ctx) {
   std::string payload;
-  uint32_t type_id;
+  uint32_t type_id = 0;
   enum class State { kNoTag, kHasType, kHasPayload, kDone };
   State state = State::kNoTag;