cfriedt commented on a change in pull request #2007:
URL: https://github.com/apache/thrift/pull/2007#discussion_r443396568
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File path: lib/cpp/src/thrift/transport/TBufferTransports.h
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@@ -587,11 +587,9 @@ class TMemoryBuffer : public
TVirtualTransport<TMemoryBuffer, TBufferBase> {
void resetBuffer() {
rBase_ = buffer_;
rBound_ = buffer_;
- wBase_ = buffer_;
- // It isn't safe to write into a buffer we don't own.
- if (!owner_) {
- wBound_ = wBase_;
- bufferSize_ = 0;
+ if (owner_) {
+ wBase_ = buffer_;
+ wBound_ = buffer_ + bufferSize_;
Review comment:
If the buffer is not owned (read-only), wbase is initialized to buffer +
wpos (the end of the buffer) and never updated, along with wbound. Throughout
the lifetime of the buffer, if it is not owned (read-only), wbase == wbound
meaning there is no space to write. Only if the buffer is owned (writeable)
should wbase and wbound be reset to the beginning / end of the buffer.
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