João Diogo Ferreira : kernel32: Fix null pointer access in GetGeoInfoW().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c790422daa4520e9f23111e8a2052cebff584abd
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=c790422daa4520e9f23111e8a2052cebff584abd

Author: João Diogo Ferreira <devilj at outlook.pt>
Date:   Sun Nov 17 18:22:35 2019 +0000

kernel32: Fix null pointer access in GetGeoInfoW().

We were failing the conditional that would point «str» to «buffW»
when retrieving the GEO_ISO_UN_NUMBER of a location with UN code 0.

Some locations will keep having no UN code, such as Guantanamo Bay or
Johnston Atoll, since that's how those are defined in Windows.

Signed-off-by: João Diogo Craveiro Ferreira <devilj at outlook.pt>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/kernel32/locale.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/dlls/kernel32/locale.c b/dlls/kernel32/locale.c
index 323110daa6..18edc8f7ba 100644
--- a/dlls/kernel32/locale.c
+++ b/dlls/kernel32/locale.c
@@ -4171,10 +4171,10 @@ BOOL WINAPI SetUserGeoID(GEOID geoid)
 INT WINAPI GetGeoInfoW(GEOID geoid, GEOTYPE geotype, LPWSTR data, int data_len, LANGID lang)
 {
     const struct geoinfo_t *ptr;
-    const WCHAR *str = NULL;
     WCHAR buffW[12];
-    LONG val = 0;
-    INT len;
+    const WCHAR *str = buffW;
+    int len;
+    static const WCHAR fmtW[] = {'%','d',0};
 
     TRACE("%d %d %p %d %d\n", geoid, geotype, data, data_len, lang);
 
@@ -4185,20 +4185,20 @@ INT WINAPI GetGeoInfoW(GEOID geoid, GEOTYPE geotype, LPWSTR data, int data_len,
 
     switch (geotype) {
     case GEO_NATION:
-        val = geoid;
+        sprintfW(buffW, fmtW, ptr->id);
         break;
     case GEO_ISO_UN_NUMBER:
-        val = ptr->uncode;
+        sprintfW(buffW, fmtW, ptr->uncode);
         break;
     case GEO_PARENT:
-        val = ptr->parent;
+        sprintfW(buffW, fmtW, ptr->parent);
         break;
     case GEO_ISO2:
+        str = ptr->iso2W;
+        break;
     case GEO_ISO3:
-    {
-        str = geotype == GEO_ISO2 ? ptr->iso2W : ptr->iso3W;
+        str = ptr->iso3W;
         break;
-    }
     case GEO_RFC1766:
     case GEO_LCID:
     case GEO_FRIENDLYNAME:
@@ -4216,12 +4216,6 @@ INT WINAPI GetGeoInfoW(GEOID geoid, GEOTYPE geotype, LPWSTR data, int data_len,
         return 0;
     }
 
-    if (val) {
-        static const WCHAR fmtW[] = {'%','d',0};
-        sprintfW(buffW, fmtW, val);
-        str = buffW;
-    }
-
     len = strlenW(str) + 1;
     if (!data || !data_len)
         return len;