Piotr Caban : msvcrt: Fix error handling in _mbsupr_s_l.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 25bbc7e9964d9248afb73cb002a990bee8a441ae
URL:    https://gitlab.winehq.org/wine/wine/-/commit/25bbc7e9964d9248afb73cb002a990b...

Author: Piotr Caban 
Date:   Wed Oct 19 13:41:44 2022 +0200

msvcrt: Fix error handling in _mbsupr_s_l.

---

dlls/msvcrt/mbcs.c         | 15 ++++++---------
 dlls/msvcrt/tests/string.c |  2 +-
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/dlls/msvcrt/mbcs.c b/dlls/msvcrt/mbcs.c
index d098f5b23f4..e275991343d 100644
--- a/dlls/msvcrt/mbcs.c
+++ b/dlls/msvcrt/mbcs.c
@@ -2194,15 +2194,12 @@ unsigned char* CDECL _mbsupr(unsigned char* s)
  */
 int CDECL _mbsupr_s_l(unsigned char* s, size_t len, _locale_t locale)
 {
+  unsigned char *p = s;
+
   if (!s && !len)
-  {
     return 0;
-  }
-  else if (!s || !len)
-  {
-    *_errno() = EINVAL;
+  if (!MSVCRT_CHECK_PMT(s && len))
     return EINVAL;
-  }

if (get_mbcinfo()->ismbcodepage)
   {
@@ -2225,12 +2222,12 @@ int CDECL _mbsupr_s_l(unsigned char* s, size_t len, _locale_t locale)
       *s = _toupper_l(*s, locale);
   }

-  if (*s)
+  if (!MSVCRT_CHECK_PMT(len))
   {
-    *s = '\0';
-    *_errno() = EINVAL;
+    *p = 0;
     return EINVAL;
   }
+  *s = 0;
   return 0;
 }

diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index 905607e416d..7a3d4b636b3 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -2879,7 +2879,7 @@ static void test__mbsupr_s(void)

memcpy(buffer, "abcdefgh", sizeof("abcdefgh"));
     errno = EBADF;
-    ret = p_mbsupr_s(buffer, 4);
+    ret = p_mbsupr_s(buffer, sizeof("abcdefgh") - 1);
     ok(ret == EINVAL, "Expected _mbsupr_s to return EINVAL, got %d\n", ret);
     ok(errno == EINVAL, "Expected errno to be EINVAL, got %d\n", errno);