Commit 843293bed0601dd115a70b2f9e94800d6eb2babc
2017-08-09T20:26:16
Fixed bug 3701 - WM_TOUCH message may cause calls to null if touch functions are not properly loaded Simon Hug When WIN_WindowProc processes the WM_TOUCH message, it doesn't check if the touch functions have been properly loaded and may call a NULL pointer. It's probably an extremely rare case, but here's a patch that adds some checks anyway.
diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
index 926f526..afa2d71 100644
--- a/src/video/windows/SDL_windowsevents.c
+++ b/src/video/windows/SDL_windowsevents.c
@@ -884,7 +884,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
break;
case WM_TOUCH:
- {
+ if (data->videodata->GetTouchInputInfo && data->videodata->CloseTouchInputHandle) {
UINT i, num_inputs = LOWORD(wParam);
PTOUCHINPUT inputs = SDL_stack_alloc(TOUCHINPUT, num_inputs);
if (data->videodata->GetTouchInputInfo((HTOUCHINPUT)lParam, num_inputs, inputs, sizeof(TOUCHINPUT))) {