Rémi Bernon : kernelbase: Validate pointers before calling heap functions.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: e0ea2318921b0c91897818f12590e6454869f8bd
URL:    https://gitlab.winehq.org/wine/wine/-/commit/e0ea2318921b0c91897818f12590e64...

Author: Rémi Bernon 
Date:   Sat Nov 12 14:28:00 2022 +0100

kernelbase: Validate pointers before calling heap functions.

---

dlls/kernelbase/memory.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/kernelbase/memory.c b/dlls/kernelbase/memory.c
index 2a503587e93..4c462c1633b 100644
--- a/dlls/kernelbase/memory.c
+++ b/dlls/kernelbase/memory.c
@@ -903,7 +903,8 @@ HLOCAL WINAPI DECLSPEC_HOTPATCH LocalFree( HLOCAL handle )
     TRACE_(globalmem)( "handle %p\n", handle );

RtlLockHeap( heap );
-    if ((ptr = unsafe_ptr_from_HLOCAL( handle )))
+    if ((ptr = unsafe_ptr_from_HLOCAL( handle )) &&
+        HeapValidate( heap, HEAP_NO_SERIALIZE, ptr ))
     {
         if (HeapFree( heap, HEAP_NO_SERIALIZE, ptr )) ret = 0;
     }
@@ -985,7 +986,8 @@ HLOCAL WINAPI DECLSPEC_HOTPATCH LocalReAlloc( HLOCAL handle, SIZE_T size, UINT f
     if (flags & LMEM_ZEROINIT) heap_flags |= HEAP_ZERO_MEMORY;

RtlLockHeap( heap );
-    if ((ptr = unsafe_ptr_from_HLOCAL( handle )))
+    if ((ptr = unsafe_ptr_from_HLOCAL( handle )) &&
+        HeapValidate( heap, HEAP_NO_SERIALIZE, ptr ))
     {
         if (flags & LMEM_MODIFY) ret = handle;
         else