Piotr Caban : ntdll: Fix UNC path handling in alloc_module.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9ff41324ae33164a4bee90772a2ba5dfd5545c4a
URL:    https://gitlab.winehq.org/wine/wine/-/commit/9ff41324ae33164a4bee90772a2ba5d...

Author: Piotr Caban 
Date:   Fri May 24 13:11:56 2024 +0200

ntdll: Fix UNC path handling in alloc_module.

---

dlls/ntdll/loader.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 31bfe60d121..5c59d102dd9 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -1518,8 +1518,17 @@ static WINE_MODREF *alloc_module( HMODULE hModule, const UNICODE_STRING *nt_name
     InitializeListHead(&wm->ldr.DdagNode->Modules);
     InsertTailList(&wm->ldr.DdagNode->Modules, &wm->ldr.NodeModuleLink);

-    memcpy( buffer, nt_name->Buffer + 4 /* ??\ prefix */, nt_name->Length - 4 * sizeof(WCHAR) );
-    buffer[nt_name->Length/sizeof(WCHAR) - 4] = 0;
+    if (nt_name->Length >= 8 * sizeof(WCHAR) && !wcsncmp(nt_name->Buffer + 4, L"UNC\", 4))
+    {
+        buffer[0] = '\';
+        memcpy( buffer + 1, nt_name->Buffer + 7 /* ??\UNC prefix */, nt_name->Length - 7 * sizeof(WCHAR) );
+        buffer[nt_name->Length/sizeof(WCHAR) - 6] = 0;
+    }
+    else
+    {
+        memcpy( buffer, nt_name->Buffer + 4 /* ??\ prefix */, nt_name->Length - 4 * sizeof(WCHAR) );
+        buffer[nt_name->Length/sizeof(WCHAR) - 4] = 0;
+    }
     if ((p = wcsrchr( buffer, '\' ))) p++;
     else p = buffer;
     RtlInitUnicodeString( &wm->ldr.FullDllName, buffer );