Check the display device before dereferencing

Kontrabant · Kontrabant · commit 0c3603d8937f · 2025-03-03T11:25:25.000-05:00
It can be null if the desktop mode is set early during initial display enumeration. (cherry picked from commit 0ccf272)
diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
@@ -1435,7 +1435,7 @@ void SDL_SetDesktopDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode
 {
     SDL_DisplayMode last_mode;
 
-    if (display->fullscreen_window || display->device->setting_display_mode) {
+    if (display->fullscreen_window || (display->device && display->device->setting_display_mode)) {
         // This is a temporary mode change, don't save the desktop mode
         return;
     }

Original file line number	Diff line number	Diff line change
`@@ -1435,7 +1435,7 @@ void SDL_SetDesktopDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode`
`1435`	`1435`	`{`
`1436`	`1436`	`SDL_DisplayMode last_mode;`
`1437`	`1437`
`1438`		`- if (display->fullscreen_window \|\| display->device->setting_display_mode) {`
	`1438`	`+ if (display->fullscreen_window \|\| (display->device && display->device->setting_display_mode)) {`
`1439`	`1439`	`// This is a temporary mode change, don't save the desktop mode`
`1440`	`1440`	`return;`
`1441`	`1441`	`}`