fix(#33): out-of-bound write

MiroKaku · Oct 8, 2023 · ad85f8f · ad85f8f
1 parent 399179e
commit ad85f8f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/ucrt/heap/kmalloc.cpp b/src/ucrt/heap/kmalloc.cpp
@@ -33,7 +33,7 @@ extern"C" __declspec(noinline) void* __cdecl ExReallocatePoolWithTag(
     if (NewBlock)
     {
         memset (NewBlock, 0, NewSize);
-        memmove(NewBlock, OldBlock, OldSize);
+        memmove(NewBlock, OldBlock, NewSize < OldSize ? NewSize : OldSize);
 
         ExFreePoolWithTag(OldBlock, Tag);
         return NewBlock;