Zhiyi Zhang : user32/tests: Zero initialize DEVMODE before passing it to EnumDisplaySettings().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6d68c38c886a4b7733891e6ab60c800e9187f60a
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6d68c38c886a4b7733891e6ab...

Author: Zhiyi Zhang 
Date:   Tue Aug 11 18:15:28 2020 +0800

user32/tests: Zero initialize DEVMODE before passing it to EnumDisplaySettings().

Zero initialize DEVMODE before passing it to EnumDisplaySettings(), which may write beyond the end
of the DEVMODE structure on Windows because the dmDriverExtra field is uninitialized.

Signed-off-by: Zhiyi Zhang 
Signed-off-by: Alexandre Julliard

---

dlls/user32/tests/monitor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dlls/user32/tests/monitor.c b/dlls/user32/tests/monitor.c
index 85fb2f080a..57d2ec0008 100644
--- a/dlls/user32/tests/monitor.c
+++ b/dlls/user32/tests/monitor.c
@@ -514,6 +514,7 @@ static void test_ChangeDisplaySettingsEx(void)

devices[device_count].index = device;
         lstrcpyA(devices[device_count].name, dd.DeviceName);
+        memset(&devices[device_count].original_mode, 0, sizeof(devices[device_count].original_mode));
         devices[device_count].original_mode.dmSize = sizeof(devices[device_count].original_mode);
         res = EnumDisplaySettingsA(dd.DeviceName, ENUM_CURRENT_SETTINGS, &devices[device_count].original_mode);
         ok(res, "EnumDisplaySettingsA %s failed, error %#x\n", dd.DeviceName, GetLastError());