Dmitry Timoshkov : msi: Do not attempt to copy a non-string property in MsiSummaryInfoGetProperty.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b857369f87c49f812b23320099dcb91dbdb6f320
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=b857369f87c49f812b23320099dcb91dbdb6f320

Author: Dmitry Timoshkov <dmitry at baikal.ru>
Date:   Wed Sep 19 13:27:57 2018 +0800

msi: Do not attempt to copy a non-string property in MsiSummaryInfoGetProperty.

This patch fixes the crashes when running the tests under Wine.
Currently the crashes are hidden by a custom action exception handler.

Signed-off-by: Dmitry Timoshkov <dmitry at baikal.ru>
Signed-off-by: Hans Leidekker <hans at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msi/suminfo.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/msi/suminfo.c b/dlls/msi/suminfo.c
index af3458a..98f6330 100644
--- a/dlls/msi/suminfo.c
+++ b/dlls/msi/suminfo.c
@@ -758,8 +758,10 @@ UINT WINAPI MsiSummaryInfoGetPropertyA(
         }
         __ENDTRY
 
-        if (!r)
+        if (!r && buf)
+        {
             r = msi_strncpyWtoA( buf, -1, szValueBuf, pcchValueBuf, TRUE );
+        }
 
         midl_user_free( buf );
         return r;
@@ -808,7 +810,7 @@ UINT WINAPI MsiSummaryInfoGetPropertyW(
         }
         __ENDTRY
 
-        if (!r)
+        if (!r && buf)
             r = msi_strncpyW( buf, -1, szValueBuf, pcchValueBuf );
 
         midl_user_free( buf );