fail when there are no sub authorities

[reactos.git] / reactos / dll / win32 / advapi32 / sec / sid.c

diff --git a/reactos/dll/win32/advapi32/sec/sid.c b/reactos/dll/win32/advapi32/sec/sid.c
index 7fdca70..20a904e 100644 (file)
--- a/reactos/dll/win32/advapi32/sec/sid.c
+++ b/reactos/dll/win32/advapi32/sec/sid.c
@@ -1820,7 +1820,7 @@ ConvertStringSidToSidW(IN LPCWSTR StringSid,
     }
     i = 0;
     ret = FALSE;
-    csubauth = ((cBytes - sizeof(SID)) / sizeof(DWORD)) + 1;
+    csubauth = ((cBytes - GetSidLengthRequired(0)) / sizeof(DWORD));
 
     StringSid += 2; /* Advance to Revision */
     pisid->Revision = atoiW(StringSid);