Vincent Povirk : mscoree: Don' t use a shared mono install with no drive letter.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 30baa2a833a0bbd744425a85b6ce57529aa29b59
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=30baa2a833a0bbd744425a85b6ce57529aa29b59

Author: Vincent Povirk <vincent at codeweavers.com>
Date:   Mon Apr  8 11:03:56 2019 -0500

mscoree: Don't use a shared mono install with no drive letter.

Signed-off-by: Vincent Povirk <vincent at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/mscoree/metahost.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dlls/mscoree/metahost.c b/dlls/mscoree/metahost.c
index 50d43b3..1b2abd2 100644
--- a/dlls/mscoree/metahost.c
+++ b/dlls/mscoree/metahost.c
@@ -712,6 +712,7 @@ static BOOL get_mono_path_registry(LPWSTR path)
 
 static BOOL get_mono_path_unix(const char *unix_dir, LPWSTR path)
 {
+    static const WCHAR unix_prefix[] = {'\\','\\','?','\\','u','n','i','x','\\'};
     static WCHAR * (CDECL *p_wine_get_dos_file_name)(const char*);
     LPWSTR dos_dir;
     WCHAR mono_dll_path[MAX_PATH];
@@ -728,6 +729,13 @@ static BOOL get_mono_path_unix(const char *unix_dir, LPWSTR path)
     if (!dos_dir)
         return FALSE;
 
+    if (memcmp(dos_dir, unix_prefix, sizeof(unix_prefix)) == 0)
+    {
+        /* No drive letter for this directory */
+        heap_free(dos_dir);
+        return FALSE;
+    }
+
     ret = find_mono_dll(dos_dir, mono_dll_path);
     if (ret)
         strcpyW(path, dos_dir);