Crash (segfault) in CPointerWarpProtocol when quitting SDL3 fullscreen + relative mouse mode (wp_pointer_warp_v1)

[bailwillharr]

Hyprland version

Hyprland 0.55.2 built from branch v0.55.2 at commit 39d7e20 clean

Regression

I have used hyprland for a long time and never encountered this crash before, so I'd say so.

Describe the bug

When quitting an SDL application that is in fullscreen mode, and relative mouse mode is enabled, hyprland crashes with a segmentation fault.
This appears to be due to a lack of a nullptr check in Hyprland's wp_pointer_warp_v1 implementation
at:
src/protocols/PointerWarp.cpp line 30

Reproduction steps

1. Build and run the below C code.
2. (IMPORTANT) attempt to move your mouse/touchpad.
3. Press ESC to quit the application.
4. Hyprland should have just crashed.

System info, crash report, and config

systeminfo.txt
crash_report.txt
hyprland.lua.txt

Reproduction code

#include <stdio.h>

#include <SDL3/SDL_events.h>
#include <SDL3/SDL_mouse.h>
#include <SDL3/SDL_render.h>
#include <SDL3/SDL_scancode.h>
#include <SDL3/SDL_init.h>

int main(void)
{
	if (!SDL_Init(SDL_INIT_VIDEO)) {
		printf("SDL_Init() error: %s\n", SDL_GetError());
		return 1;
	}

	SDL_Window* win = NULL;
	SDL_Renderer* ren = NULL;
	if (!SDL_CreateWindowAndRenderer("window", 640, 480, SDL_WINDOW_FULLSCREEN, &win, &ren)) {
		printf("SDL_CreateWindowAndRenderer() error: %s\n", SDL_GetError());
		return 1;
	}

	if (!SDL_SetWindowRelativeMouseMode(win, true)) {
		printf("SDL_SetWindowRelativeMouseMode() error: %s\n", SDL_GetError());
		return 1;
	}

	bool running = true;
	while (running) {
		SDL_Event ev = {};
		while (SDL_PollEvent(&ev)) {
			if (ev.type == SDL_EVENT_QUIT) {
				running = false;
			}
			if (ev.type == SDL_EVENT_KEY_DOWN && ev.key.scancode == SDL_SCANCODE_ESCAPE) {
				running = false;
			}
		}

		SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);
		SDL_RenderClear(ren);
		if (!SDL_RenderPresent(ren)) {
			printf("SDL_RenderPresent() error: %s\n", SDL_GetError());
			return 1;
		}
	}

	SDL_DestroyRenderer(ren);
	SDL_DestroyWindow(win);
	SDL_Quit();

	return 0;
}

[vaxerski]

thanks! #15021