Bug#1084021: regression in 2.4.2-3+deb12u8: client hangs retrieving printer information

[Marcin Owsiany <porridge@debian.org>]

Package: cups
Version: 2.4.2-3+deb12u8
Severity: serious
X-Debbugs-Cc: team@security.debian.org

My setup:
- headless host A running cups 2.4.2-3+deb12u8, with printer connected
  via USB, makes the printer available to host B
- host B running cups 2.4.2-3+deb12u7, printing from evince. Works like
  a charm.

Then I:
- upgrade cups on host B to 2.4.2-3+deb12u8
- restart evince, press CTRL+P, select the printer by clicking on it
  once in the printing dialog
- this hangs displaying a (localized) message that I think might be
  something like "Retrieving printer information..." in the original.

I tried other combination of versions. It seems 2.4.2-3+deb12u8 on host
B is what breaks things.

I'm more than happy to provide information on the configuration, just
please let me know what to provide, printing remains a black magic to me
:-(

FWIW the printer looks the same in GNOME printer settings dialog on host
B whether it works for evince or not - the printer address is "(null)"
in both cases.

-- System Information:
Debian Release: 12.7
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-25-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages cups depends on:
ii  cups-client            2.4.2-3+deb12u8
ii  cups-common            2.4.2-3+deb12u8
ii  cups-core-drivers      2.4.2-3+deb12u8
ii  cups-daemon            2.4.2-3+deb12u8
ii  cups-filters           1.28.17-3+deb12u1
ii  cups-ppdc              2.4.2-3+deb12u8
ii  cups-server-common     2.4.2-3+deb12u8
ii  debconf [debconf-2.0]  1.5.82
ii  ghostscript            10.0.0~dfsg-11+deb12u5
ii  libavahi-client3       0.8-10
ii  libavahi-common3       0.8-10
ii  libc6                  2.36-9+deb12u8
ii  libcups2               2.4.2-3+deb12u8
ii  libgcc-s1              12.2.0-14
ii  libstdc++6             12.2.0-14
ii  libusb-1.0-0           2:1.0.26-1
ii  poppler-utils          22.12.0-2+b1
ii  procps                 2:4.0.2-3

Versions of packages cups recommends:
ii  avahi-daemon  0.8-10
ii  colord        1.4.6-2.2

Versions of packages cups suggests:
pn  cups-bsd                                   <none>
pn  cups-pdf                                   <none>
pn  foomatic-db-compressed-ppds | foomatic-db  <none>
pn  smbclient                                  <none>
ii  udev                                       252.30-1~deb12u2

-- debconf information:
  cupsys/raw-print: true
  cupsys/backend: lpd, socket, usb, snmp, dnssd