Piotr Caban : ucrtbase: Fix buffer overflow error when printing hexadecimal floating point number.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 61dbb53fefac9b825656468f858eeac06c98c9d3
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=61dbb53fefac9b825656468f8...

Author: Piotr Caban <piotr(a)codeweavers.com>
Date:   Wed Jul  8 19:47:40 2020 +0200

ucrtbase: Fix buffer overflow error when printing hexadecimal floating point number.

Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/msvcrt/printf.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/msvcrt/printf.h b/dlls/msvcrt/printf.h
index 69eb8b1955..81960c19f6 100644
--- a/dlls/msvcrt/printf.h
+++ b/dlls/msvcrt/printf.h
@@ -415,7 +415,7 @@ static inline int FUNC_NAME(pf_output_hex_fp)(FUNC_NAME(puts_clbk) pf_puts, void
         { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' }
     };
 
-    APICHAR pfx[16], sfx[8], *p;
+    APICHAR pfx[4+MANT_BITS/4+1], sfx[8], *p;
     ULONGLONG mant;
     int len = 0, sfx_len = 0, r, exp;