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Enable aliasing when parsing lazy fields.

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PiperOrigin-RevId: 967992657
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Protobuf Team Bot 2026-08-20 12:43:20 -07:00 • committed by Copybara-Service
parent 50c6c24a2b
commit ef765ceb27
1 changed files with 8 additions and 5 deletions
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13
java/core/src/main/java/com/google/protobuf/InternalLazyField.java
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@ -210,14 +210,17 @@ class InternalLazyField {
}
try {
// `bytes` is guaranteed to be non-null since `value` was null.
CodedInputStream input = bytes.newCodedInput();
input.enableAliasing(/* enabled= */ true);
// When lazyExtensionEnabled() returns true, it means all extensions including MessageSet's
// will be fully parsed. When it returns false, it basically implies this is a message set
// extension, and we should fall back to the old behavior of silently returning the default
// instance on corrupted extensions i.e. full parse.
// will be fully parsed. When it returns false, it basically implies this can only be a
// MessageSet extension, and we should fall back to the old behavior of silently returning
// the default instance on corrupted extensions i.e. a full parse.
value =
ExtensionRegistryLite.lazyExtensionEnabled()
? defaultInstance.getParserForType().parsePartialFrom(bytes, extensionRegistry)
: defaultInstance.getParserForType().parseFrom(bytes, extensionRegistry);
? defaultInstance.getParserForType().parsePartialFrom(input, extensionRegistry)
: defaultInstance.getParserForType().parseFrom(input, extensionRegistry);
input.checkLastTagWas(0);
} catch (InvalidProtocolBufferException e) {
corrupted = true;
throw e;