[reactos] 01/01: [ADVAPI32] Avoid excessive allocation in CheckTokenMembership. CORE-16094

[Michael Maltsev]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=a303932803d5939c4b682…

commit a303932803d5939c4b6820f693fef310e48ee18b
Author:     Michael Maltsev <4129781+m417z(a)users.noreply.github.com>
AuthorDate: Mon Jun 3 12:35:58 2019 +0300
Commit:     Thomas Faber <thomas.faber(a)reactos.org>
CommitDate: Sun Jul 21 11:39:30 2019 +0200

    [ADVAPI32] Avoid excessive allocation in CheckTokenMembership. CORE-16094
---
 dll/win32/advapi32/token/token.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dll/win32/advapi32/token/token.c b/dll/win32/advapi32/token/token.c
index 0c3cacd7725..32ef4064c6b 100644
--- a/dll/win32/advapi32/token/token.c
+++ b/dll/win32/advapi32/token/token.c
@@ -100,7 +100,7 @@ CheckTokenMembership(IN HANDLE ExistingTokenHandle,
                                          0,
                                          sizeof(SECURITY_DESCRIPTOR) +
                                              sizeof(ACL) + SidLen +
-                                             sizeof(ACCESS_ALLOWED_ACE));
+                                             FIELD_OFFSET(ACCESS_ALLOWED_ACE,
SidStart));
     if (SecurityDescriptor == NULL)
     {
         Status = STATUS_INSUFFICIENT_RESOURCES;
@@ -134,7 +134,7 @@ CheckTokenMembership(IN HANDLE ExistingTokenHandle,
     /* create the DACL */
     Dacl = (PACL)(SecurityDescriptor + 1);
     Status = RtlCreateAcl(Dacl,
-                          sizeof(ACL) + SidLen + sizeof(ACCESS_ALLOWED_ACE),
+                          sizeof(ACL) + SidLen + FIELD_OFFSET(ACCESS_ALLOWED_ACE,
SidStart),
                           ACL_REVISION);
     if (!NT_SUCCESS(Status))
     {