kernel32: Don't use depth in RtlInterlockedFlushSList.

dlls/kernel32/tests/sync.c

@@ -244,8 +244,9 @@ static void test_slist(void)
     } item1, item2, item3, *pitem;
 
     SLIST_HEADER slist_header;
-    PSLIST_ENTRY entry;
+    PSLIST_ENTRY entry, next;
     USHORT size;
+    int i;
 
     VOID (WINAPI *pInitializeSListHead)(PSLIST_HEADER);
     USHORT (WINAPI *pQueryDepthSList)(PSLIST_HEADER);
@@ -323,6 +324,21 @@ static void test_slist(void)
     }
     ok(((struct item*)entry)->value == 2, "item 2 not in front of list\n");
     ok(((struct item*)entry->Next)->value == 1, "item 1 not at the back of list\n");
+
+    for (i = 0; i < 65536; i++)
+    {
+        entry = HeapAlloc(GetProcessHeap(), 0, sizeof(*entry));
+        pInterlockedPushEntrySList(&slist_header, entry);
+    }
+
+    entry = pInterlockedFlushSList(&slist_header);
+    ok(entry != NULL, "not flushed\n");
+    while (entry)
+    {
+        next = entry->Next;
+        HeapFree(GetProcessHeap(), 0, entry);
+        entry = next;
+    }
 }
 
 static void test_event(void)

dlls/ntdll/rtl.c

@@ -1080,7 +1080,7 @@ PSLIST_ENTRY WINAPI RtlInterlockedFlushSList(PSLIST_HEADER list)
     SLIST_HEADER old, new;
 
 #ifdef _WIN64
-    if (!list->Header16.Depth) return NULL;
+    if (!list->Header16.NextEntry) return NULL;
     new.s.Alignment = new.s.Region = 0;
     new.Header16.HeaderType = 1;  /* we use the 16-byte header */
     do
@@ -1090,7 +1090,7 @@ PSLIST_ENTRY WINAPI RtlInterlockedFlushSList(PSLIST_HEADER list)
     } while (!interlocked_cmpxchg128((__int64 *)list, new.s.Region, new.s.Alignment, (__int64 *)&old));
     return (SLIST_ENTRY *)((ULONG_PTR)old.Header16.NextEntry << 4);
 #else
-    if (!list->s.Depth) return NULL;
+    if (!list->s.Next.Next) return NULL;
     new.Alignment = 0;
     do
     {