Never pass null pointer in vsnprintf, since our size available is nev…

…er 0
project-chip · Jun 30, 2023 · 3685791 · 3685791
1 parent 2077d6b
commit 3685791
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/lib/support/StringBuilder.cpp b/src/lib/support/StringBuilder.cpp
@@ -28,6 +28,8 @@ StringBuilderBase & StringBuilderBase::AddFormat(const char * format, ...)
     if (mWriter.Available() > 0)
     {
         output = reinterpret_cast<char *>(mWriter.Buffer() + mWriter.Needed());
+    } else {
+        output = reinterpret_cast<char *>(mWriter.Buffer() + mWriter.Size());
     }
 
     // the + 1 size here because StringBuilder reserves one byte for final null terminator