Joachim Priesner : ntdll: Fix read buffer overflow in find_file_in_dir().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: e533a26dcff611f312e5bfce47061d2155476c42
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=e533a26dcff611f312e5bfce4...

Author: Joachim Priesner <joachim.priesner(a)web.de>
Date:   Thu Oct 22 18:29:49 2020 +0200

ntdll: Fix read buffer overflow in find_file_in_dir().

Signed-off-by: Joachim Priesner <joachim.priesner(a)web.de>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/ntdll/unix/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index afb552be098..d12a3ffb119 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -2550,6 +2550,8 @@ static NTSTATUS find_file_in_dir( char *unix_name, int pos, const WCHAR *name, i
                         goto not_found;
                     }
                 }
+                /* if that did not work, restore previous state of unix_name */
+                unix_name[pos - 1] = 0;
             }
             close( fd );
         }