[PATCH 0/1] MR3190: kernelbase: Check if locale is NULL before using it in Internal_EnumDateFormats().

[Zhiyi Zhang (＠zhiyi)]

Initialize the calendars variable after checking if locale is NULL before using it to avoid NULL
pointer references. Fix a Excel 2016 crash when formatting dates with the custom format 'ddd'.

[PATCH 1/1] kernelbase: Check if locale is NULL before using it in Internal_EnumDateFormats().

[Zhiyi Zhang]

From: Zhiyi Zhang

Initialize the calendars variable after checking if locale is NULL before using it to avoid NULL
pointer references. Fix a Excel 2016 crash when formatting dates with the custom format 'ddd'.
---
 dlls/kernelbase/locale.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/kernelbase/locale.c b/dlls/kernelbase/locale.c
index 45180f4bb8a..e8060fe9205 100644
--- a/dlls/kernelbase/locale.c
+++ b/dlls/kernelbase/locale.c
@@ -4390,7 +4390,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH Internal_EnumDateFormats( DATEFMT_ENUMPROCW proc,
     INT i, j, ret;
     DWORD pos;
     const struct calendar *cal;
-    const USHORT *calendars = locale_strings + locale->scalendartype;
+    const USHORT *calendars;
     const DWORD *array;

if (!proc || !locale)
@@ -4399,6 +4399,8 @@ BOOL WINAPI DECLSPEC_HOTPATCH Internal_EnumDateFormats( DATEFMT_ENUMPROCW proc,
         return FALSE;
     }

+    calendars = locale_strings + locale->scalendartype;
+
     switch (flags & ~LOCALE_USE_CP_ACP)
     {
     case 0:

[Nikolay Sivov (＠nsivov)]

Could you add a test for how this is called by Excel? Specifically, is it called with actually invalid locale, or is it a valid one that we don't recognize.