gtk2 application segfault with libxi 1.7.7

Submitted by j.w..@..il.com

Assigned to Xorg Project Team

Link to original bug (#98204)

Description

Since libxi 1.7.7 GTK2 applications crash when certain input devices are plugged in. At least some Wacom tablets and Microsoft game controllers trigger a segmentation fault. Removing lines 224 and 225 from src/XListDev.c:XListInputDevices

if (!s)
    goto out;

prevents the error from happening. These lines were added in commit 19a9cd60, the only commit from 1.7.6 to 1.7.7.

Mentions: https://bugs.archlinux.org/task/51298 https://bbs.archlinux.org/viewtopic.php?pid=1659799 https://lwn.net/Articles/703097/