[reactos] 01/01: [SETUPAPI] CM_Set_Class_Registry_PropertyW: Do not convert SD if ulLength is 0

[Eric Kohl]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=4d376dfd6487d63c3374f6...

commit 4d376dfd6487d63c3374f62d75dcb82a4563aac3
Author:     Eric Kohl [e-mail]
AuthorDate: Sat Dec 14 20:09:27 2024 +0100
Commit:     Eric Kohl [e-mail]
CommitDate: Sat Dec 14 20:09:27 2024 +0100

[SETUPAPI] CM_Set_Class_Registry_PropertyW: Do not convert SD if ulLength is 0
---
 dll/win32/setupapi/cfgmgr.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/dll/win32/setupapi/cfgmgr.c b/dll/win32/setupapi/cfgmgr.c
index 0444611c184..f0b49db3fe9 100644
--- a/dll/win32/setupapi/cfgmgr.c
+++ b/dll/win32/setupapi/cfgmgr.c
@@ -7975,17 +7975,21 @@ CM_Set_Class_Registry_PropertyW(

if (ulProperty == CM_CRP_SECURITY_SDS)
     {
-        if (!ConvertStringSecurityDescriptorToSecurityDescriptorW((LPCWSTR)Buffer,
-                                                                  SDDL_REVISION_1,
-                                                                  &pSecurityDescriptor,
-                                                                  &SecurityDescriptorSize))
+        if (ulLength != 0)
         {
-            ERR("ConvertStringSecurityDescriptorToSecurityDescriptorW() failed (Error %lu)\n", GetLastError());
-            return CR_INVALID_DATA;
+            if (!ConvertStringSecurityDescriptorToSecurityDescriptorW((LPCWSTR)Buffer,
+                                                                      SDDL_REVISION_1,
+                                                                      &pSecurityDescriptor,
+                                                                      &SecurityDescriptorSize))
+            {
+                ERR("ConvertStringSecurityDescriptorToSecurityDescriptorW() failed (Error %lu)\n", GetLastError());
+                return CR_INVALID_DATA;
+            }
+
+            Buffer = (PCVOID)pSecurityDescriptor;
+            ulLength = SecurityDescriptorSize;
         }

-        Buffer = (PCVOID)pSecurityDescriptor;
-        ulLength = SecurityDescriptorSize;
         ulProperty = CM_CRP_SECURITY;
         ulType = REG_BINARY;
     }