Merge pull request #4590 from PetterS/undefined_fix
Fix error in Clang UndefinedBehaviorSanitizer
diff --git a/src/google/protobuf/io/printer.cc b/src/google/protobuf/io/printer.cc
index 8493268..de67cef 100644
--- a/src/google/protobuf/io/printer.cc
+++ b/src/google/protobuf/io/printer.cc
@@ -350,10 +350,12 @@
while (size > buffer_size_) {
// Data exceeds space in the buffer. Copy what we can and request a
// new buffer.
- memcpy(buffer_, data, buffer_size_);
- offset_ += buffer_size_;
- data += buffer_size_;
- size -= buffer_size_;
+ if (buffer_size_ > 0) {
+ memcpy(buffer_, data, buffer_size_);
+ offset_ += buffer_size_;
+ data += buffer_size_;
+ size -= buffer_size_;
+ }
void* void_buffer;
failed_ = !output_->Next(&void_buffer, &buffer_size_);
if (failed_) return;
