darwin: Don't pass NULL device refs to IOHIDDeviceGetValue().

Possibly fixes Bugzilla #4961.
libsdl-org · Jan 27, 2020 · 059de38 · 059de38
1 parent b4c2e29
commit 059de38
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/joystick/darwin/SDL_sysjoystick.c b/src/joystick/darwin/SDL_sysjoystick.c
@@ -161,7 +161,7 @@ GetHIDElementState(recDevice *pDevice, recElement *pElement, SInt32 *pValue)
     SInt32 value = 0;
     int returnValue = SDL_FALSE;
 
-    if (pDevice && pElement) {
+    if (pDevice && pDevice->deviceRef && pElement) {
         IOHIDValueRef valueRef;
         if (IOHIDDeviceGetValue(pDevice->deviceRef, pElement->elementRef, &valueRef) == kIOReturnSuccess) {
             value = (SInt32) IOHIDValueGetIntegerValue(valueRef);