Rémi Bernon : dbghelp: Prevent an invalid memory access when the search path element is empty.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d263ba97fb7c9ada7ae847909f35cbf5db671216
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=d263ba97fb7c9ada7ae847909...

Author: Rémi Bernon 
Date:   Thu Aug 29 12:36:58 2019 +0200

dbghelp: Prevent an invalid memory access when the search path element is empty.

Signed-off-by: Rémi Bernon 
Signed-off-by: Alexandre Julliard

---

dlls/dbghelp/path.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dlls/dbghelp/path.c b/dlls/dbghelp/path.c
index a0fc0cf..f8a7f3d 100644
--- a/dlls/dbghelp/path.c
+++ b/dlls/dbghelp/path.c
@@ -229,6 +229,7 @@ static BOOL do_searchW(PCWSTR file, PWSTR buffer, BOOL recurse,
     static const WCHAR  S_DotDotW[] = {'.','.','\0'};

pos = strlenW(buffer);
+    if (pos == 0) return FALSE;
     if (buffer[pos - 1] != '\') buffer[pos++] = '\';
     strcpyW(buffer + pos, S_AllW);
     if ((h = FindFirstFileW(buffer, &fd)) == INVALID_HANDLE_VALUE)