SDL2/fix-xi2-crash.patch

From fdb86b8266947e225f058b32ebb77fa949f6ae42 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Mon, 4 Jul 2022 12:48:32 -0400
Subject: [PATCH] x11: Don't try to use XInput2 multitouch if not supported.

Fixes #5889.
---
 src/video/x11/SDL_x11touch.c   |  4 +---
 src/video/x11/SDL_x11xinput2.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/video/x11/SDL_x11touch.c b/src/video/x11/SDL_x11touch.c
index 958bee9df..c608cf24d 100644
--- a/src/video/x11/SDL_x11touch.c
+++ b/src/video/x11/SDL_x11touch.c
@@ -31,9 +31,7 @@
 void
 X11_InitTouch(_THIS)
 {
-    if (X11_Xinput2IsMultitouchSupported()) {
-        X11_InitXinput2Multitouch(_this);
-    }
+    X11_InitXinput2Multitouch(_this);
 }
 
 void
diff --git a/src/video/x11/SDL_x11xinput2.c b/src/video/x11/SDL_x11xinput2.c
index abfbdf0e3..21d8bd6c1 100644
--- a/src/video/x11/SDL_x11xinput2.c
+++ b/src/video/x11/SDL_x11xinput2.c
@@ -265,6 +265,11 @@ X11_InitXinput2Multitouch(_THIS)
     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
     XIDeviceInfo *info;
     int ndevices,i,j;
+
+    if (!X11_Xinput2IsMultitouchSupported()) {
+        return;
+    }
+
     info = X11_XIQueryDevice(data->display, XIAllDevices, &ndevices);
 
     for (i = 0; i < ndevices; i++) {
@@ -354,6 +359,10 @@ X11_Xinput2GrabTouch(_THIS, SDL_Window *window)
     XIGrabModifiers mods;
     XIEventMask eventmask;
 
+    if (!X11_Xinput2IsMultitouchSupported()) {
+        return;
+    }
+
     mods.modifiers = XIAnyModifier;
     mods.status = 0;
 
@@ -379,6 +388,10 @@ X11_Xinput2UngrabTouch(_THIS, SDL_Window *window)
 
     XIGrabModifiers mods;
 
+    if (!X11_Xinput2IsMultitouchSupported()) {
+        return;
+    }
+
     mods.modifiers = XIAnyModifier;
     mods.status = 0;
 
-- 
2.36.1