kernelbase: Validate nonzero size for MEM_RELEASE in VirtualFreeEx().

d8fc23d8 · Paul Gofman · Alexandre Julliard · 1d3c0d73 · d8fc23d8
Commit d8fc23d8 authored Nov 11, 2022 by Paul Gofman Committed by Alexandre Julliard May 11, 2023
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memory.c dlls/kernelbase/memory.c +6 -0

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--- a/dlls/kernelbase/memory.c
+++ b/dlls/kernelbase/memory.c
@@ -457,6 +457,12 @@ BOOL WINAPI DECLSPEC_HOTPATCH VirtualFree( void *addr, SIZE_T size, DWORD type )
 */
 BOOL WINAPI DECLSPEC_HOTPATCH VirtualFreeEx( HANDLE process, void *addr, SIZE_T size, DWORD type )
 {
+    if (type == MEM_RELEASE && size)
+    {
+        WARN( "Trying to release memory with specified size.\n" );
+        SetLastError( ERROR_INVALID_PARAMETER );
+        return FALSE;
+    }
    return set_ntstatus( NtFreeVirtualMemory( process, &addr, &size, type ));
 }