Dmitry Timoshkov : user.exe16: Fix memory leak in case when HeapReAlloc fails.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: faa13dd161fd3d0aaf14c34c86d1eda2c23a85cc
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=faa13dd161fd3d0aaf14c34c86...

Author: Dmitry Timoshkov 
Date:   Thu Jun 22 15:56:24 2017 +0800

user.exe16: Fix memory leak in case when HeapReAlloc fails.

Signed-off-by: Dmitry Timoshkov 
Signed-off-by: Alexandre Julliard 
(cherry picked from commit 8c3ed829279cb7951688392801e3210abd19d27f)
Signed-off-by: Michael Stefaniuc

---

dlls/user.exe16/user.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dlls/user.exe16/user.c b/dlls/user.exe16/user.c
index aba797d..4a00d58 100644
--- a/dlls/user.exe16/user.c
+++ b/dlls/user.exe16/user.c
@@ -3245,8 +3245,11 @@ DWORD WINAPI FormatMessage16(

/* CMF - This makes a BIG assumption about va_list */
                         while ((ret = vsnprintf(b, sz, fmtstr, (va_list) argliststart)) < 0 || ret >= sz) {
+                            LPSTR new_b;
                             sz = (ret == -1 ? sz + 100 : ret + 1);
-                            b = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, b, sz);
+                            new_b = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, b, sz);
+                            if (!new_b) break;
+                            b = new_b;
                         }
                         for (x=b; *x; x++) ADD_TO_T(*x);
                         HeapFree(GetProcessHeap(), 0, b);