[PATCH 1/2] comdlg32: Stop crash when a path is passed into Open File Dialog

[Alistair Leslie-Hughes]

From: Bruno Jesus <00cpxxx at gmail.com>

Fixes: https://bugs.winehq.org/show_bug.cgi?id=30673

Signed-off-by: Alistair Leslie-Hughes <leslie_alistair at hotmail.com>
---
 dlls/comdlg32/filedlg.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/dlls/comdlg32/filedlg.c b/dlls/comdlg32/filedlg.c
index 95eacd3..67b3566 100644
--- a/dlls/comdlg32/filedlg.c
+++ b/dlls/comdlg32/filedlg.c
@@ -1565,10 +1565,16 @@ static LRESULT FILEDLG95_InitControls(HWND hwnd)
          result = GetFullPathNameW(fodInfos->filename, MAX_PATH, tmpBuf, &nameBit);
          if (result) {
 
-            /* nameBit is always shorter than the original filename */
-            lstrcpyW(fodInfos->filename,nameBit);
+            /* nameBit is always shorter than the original filename. It may be NULL
+             * when the filename contains only a drive name instead of file name */
+            if (nameBit)
+            {
+                lstrcpyW(fodInfos->filename,nameBit);
+                *nameBit = 0x00;
+            }
+            else
+                *fodInfos->filename = '\0';
 
-            *nameBit = 0x00;
             MemFree(fodInfos->initdir);
             fodInfos->initdir = MemAlloc((lstrlenW(tmpBuf) + 1)*sizeof(WCHAR));
             lstrcpyW(fodInfos->initdir, tmpBuf);
-- 
1.9.1