From d9e2360d6253021fe41ceb0d1ece4417a246677f Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Wed, 9 Jul 2025 10:48:11 +1000
Subject: [PATCH] tablet: fix segfault on pressure-less tablets

Check whether a tablet has a pressure axis before unconditionally
dereferencing it.

Fixes: e9f3fc080cda ("tablet: revamp the tablet pressure range handling")

Closes #1152

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1263>
---
 src/evdev-tablet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/evdev-tablet.c b/src/evdev-tablet.c
index a04a5b2d..77fae45f 100644
--- a/src/evdev-tablet.c
+++ b/src/evdev-tablet.c
@@ -2162,6 +2162,9 @@ update_pressure_range(struct tablet_dispatch *tablet,
 		      struct evdev_device *device,
 		      struct libinput_tablet_tool *tool)
 {
+	if (!libevdev_has_event_code(device->evdev, EV_ABS, ABS_PRESSURE))
+		return;
+
 	double min = tool->pressure.range.min;
 	double max = tool->pressure.range.max;