Bug#1051418: obs-studio: clicking on an xcomposite window source makes obs segfault

I'm seeing the same bug in the latest Debian testing updated this morning. Specifically, if I have the following github page open in my browser clicking the xcomposite window source cases a seg fault as reported.

https://github.com/pjreddie/darknet/issues/553

This results in a window name of "Error on make: 'cuda_runtime.h: No such file or directory' · Issue #553 · pjreddie/darknet - Brave"

and the name_lower variable appears to have zero values in the struct which is then pushed to window_strings.array. I can't currently step into dstr_to_lower().

$18 = {name_lower = {array = 0x0, len = 0, capacity = 0}, name = {array = 0x5555570b88e0 "Error on make: 'cuda_runtime.h: No such file or directory' · Issue #553 · pjreddie/darknet - Brave", len = 100, capacity = 101}, desc = {

array = 0x555555c24560 "54525967\r\nError on make: 'cuda_runtime.h: No such file or directory' · Issue #553 · pjreddie/darknet - Brave\r\nbrave-browser", len = 125, capacity = 126}}

The following is the gdb backtrace:

(gdb) bt

#0 __strcmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:283

#1 0x00007ffff3e5de65 in msort_with_tmp (p=p@entry=0x7fffffffc510, b=b@entry=0x7fffffffc448, n=n@entry=3) at ./stdlib/msort.c:123

#2 0x00007ffff3e5ddb1 in msort_with_tmp (n=3, b=0x7fffffffc448, p=0x7fffffffc510) at ./stdlib/msort.c:44

#3 msort_with_tmp (p=p@entry=0x7fffffffc510, b=b@entry=0x7fffffffc430, n=n@entry=6) at ./stdlib/msort.c:53

#4 0x00007ffff3e5dd94 in msort_with_tmp (n=6, b=0x7fffffffc430, p=0x7fffffffc510) at ./stdlib/msort.c:44

#5 msort_with_tmp (p=p@entry=0x7fffffffc510, b=b@entry=0x7fffffffc430, n=n@entry=12) at ./stdlib/msort.c:52

#6 0x00007ffff3e5ddb1 in msort_with_tmp (n=12, b=0x7fffffffc430, p=0x7fffffffc510) at ./stdlib/msort.c:44

#7 msort_with_tmp (p=p@entry=0x7fffffffc510, b=0x7fffffffc3d8, n=n@entry=23) at ./stdlib/msort.c:53

#8 0x00007ffff3e5e23b in msort_with_tmp (n=23, b=<optimized out>, p=0x7fffffffc510) at ./stdlib/msort.c:44

#9 __GI___qsort_r (b=b@entry=0x5555570e2320, n=n@entry=23, s=s@entry=72, cmp=cmp@entry=0x7fffe1fdaac0 <cmp_wi>, arg=arg@entry=0x0) at ./stdlib/msort.c:253

#10 0x00007ffff3e5e3c8 in __GI_qsort (b=b@entry=0x5555570e2320, n=n@entry=23, s=s@entry=72, cmp=cmp@entry=0x7fffe1fdaac0 <cmp_wi>) at ./stdlib/msort.c:307

#11 0x00007fffe1fdbcb5 in xcompcap_props (unused=<optimized out>) at ./plugins/linux-capture/xcomposite-input.c:750

#12 0x00007ffff65629f6 in obs_source_properties () at /lib/x86_64-linux-gnu/libobs.so.0

#13 0x000055555564c3d5 in SourceToolbar::SourceToolbar(QWidget*, OBSSafeRef<obs_source*, &obs_source_get_ref, &obs_source_release>) (source=..., parent=0x555555ea89a0, this=0x555556074fd0) at ./libobs/obs.hpp:103

#14 ComboSelectToolbar::ComboSelectToolbar(QWidget*, OBSSafeRef<obs_source*, &obs_source_get_ref, &obs_source_release>) (this=this@entry=0x555556074fd0, parent=parent@entry=0x555555ea89a0, source=...) at ./UI/context-bar-controls.cpp:116

#15 0x000055555564c562 in WindowCaptureToolbar::WindowCaptureToolbar(QWidget*, OBSSafeRef<obs_source*, &obs_source_get_ref, &obs_source_release>) (this=this@entry=0x555556074fd0, parent=0x555555ea89a0, source=...) at ./UI/context-bar-controls.cpp:245

#16 0x00005555556f90f5 in OBSBasic::UpdateContextBar(bool) (this=0x555555cf9d60, force=<optimized out>) at ./UI/window-basic-main.cpp:3373

#17 0x00007ffff456e590 in QObject::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#18 0x00007ffff53828be in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt6Widgets.so.6

#19 0x00007ffff4532a48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#20 0x00007ffff4532c27 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#21 0x00007ffff47198e3 in () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#22 0x00007ffff312b1b4 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0

#23 0x00007ffff312e2d7 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0

#24 0x00007ffff312e8f0 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0

#25 0x00007ffff471768c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#26 0x00007ffff453c8ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#27 0x00007ffff4535846 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt6Core.so.6

#28 0x00005555555f134f in run_program (argv=0x7fffffffd8c8, argc=<optimized out>, logFile=...) at ./UI/obs-app.cpp:2524

#29 main(int, char**) (argc=<optimized out>, argv=0x7fffffffd8c8) at ./UI/obs-app.cpp:3435