fix(dwio): Buffer corruption when new capacity is less than old size

nmahadevuni · Mar 11, 2025 · 876d78a · 876d78a
1 parent c2eb47b
commit 876d78a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/velox/dwio/common/BufferUtil.h b/velox/dwio/common/BufferUtil.h
@@ -45,7 +45,7 @@ inline void ensureCapacity(
     }
   }
 
-  if (clearBits) {
+  if (clearBits && capacity > oldSize) {
     std::memset(
         (void*)(data->asMutable<int8_t>() + oldSize), 0L, capacity - oldSize);
   }