Eric Pouech : secur32: Use SecureZeroMemory to clear magic fields.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0e967a5cec5cbe2932da942642be0b279336db13
URL:    https://gitlab.winehq.org/wine/wine/-/commit/0e967a5cec5cbe2932da942642be0b2...

Author: Eric Pouech <epouech(a)codeweavers.com>
Date:   Tue Nov  7 19:11:27 2023 +0100

secur32: Use SecureZeroMemory to clear magic fields.

Signed-off-by: Eric Pouech <epouech(a)codeweavers.com>

---

 dlls/secur32/lsa.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/secur32/lsa.c b/dlls/secur32/lsa.c
index 7af9c285d86..3f119df04d0 100644
--- a/dlls/secur32/lsa.c
+++ b/dlls/secur32/lsa.c
@@ -156,7 +156,8 @@ NTSTATUS WINAPI LsaDeregisterLogonProcess(HANDLE LsaHandle)
     TRACE("%p\n", LsaHandle);
 
     if (!lsa_conn || lsa_conn->magic != LSA_MAGIC_CONNECTION) return STATUS_INVALID_HANDLE;
-    lsa_conn->magic = 0;
+    /* Ensure compiler doesn't optimize out the assignment with 0. */
+    SecureZeroMemory(&lsa_conn->magic, sizeof(lsa_conn->magic));
     free(lsa_conn);
 
     return STATUS_SUCCESS;
@@ -465,7 +466,8 @@ static SECURITY_STATUS WINAPI lsa_FreeCredentialsHandle(CredHandle *credential)
 
     status = lsa_cred->package->lsa_api->FreeCredentialsHandle(lsa_cred->handle);
 
-    lsa_cred->magic = 0;
+    /* Ensure compiler doesn't optimize out the assignment with 0. */
+    SecureZeroMemory(&lsa_cred->magic, sizeof(lsa_cred->magic));
     free(lsa_cred);
     return status;
 }