diff --git a/libs/binder/BufferedTextOutput.cpp b/libs/binder/BufferedTextOutput.cpp
index fb424fd..824b56b 100644
--- a/libs/binder/BufferedTextOutput.cpp
+++ b/libs/binder/BufferedTextOutput.cpp
@@ -49,9 +49,10 @@
     }
     
     status_t append(const char* txt, size_t len) {
+        if (len > SIZE_MAX - bufferPos) return NO_MEMORY; // overflow
         if ((len+bufferPos) > bufferSize) {
+            if ((len + bufferPos) > SIZE_MAX / 3) return NO_MEMORY; // overflow
             size_t newSize = ((len+bufferPos)*3)/2;
-            if (newSize < (len+bufferPos)) return NO_MEMORY;    // overflow
             void* b = realloc(buffer, newSize);
             if (!b) return NO_MEMORY;
             buffer = (char*)b;