M src/util/ring-fifo.c → src/util/ring-fifo.c

@@ -75,6 +75,10 @@ ATOMIC_LOAD(end, buffer->writePtr);
 
 	// Wrap around if we can't fit enough in here
 	if ((intptr_t) data - (intptr_t) buffer->data + length >= buffer->capacity) {
+		if (end == data) {
+			// Oops! If we wrap now, it'll appear full
+			return 0;
+		}
 		data = buffer->data;
 	}