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-rw-r--r--src/rt/circular_buffer.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rt/circular_buffer.cpp b/src/rt/circular_buffer.cpp
index bdf25124..77509abb 100644
--- a/src/rt/circular_buffer.cpp
+++ b/src/rt/circular_buffer.cpp
@@ -62,7 +62,7 @@ circular_buffer::enqueue(void *src) {
I(dom, _unread <= _buffer_sz);
// Grow if necessary.
- if (_unread == _buffer_sz) {
+ if (_unread + unit_sz > _buffer_sz) {
size_t new_buffer_sz = _buffer_sz << 1;
I(dom, new_buffer_sz <= MAX_CIRCULAR_BUFFFER_SIZE);
void *new_buffer = dom->malloc(new_buffer_sz);