[FIPS 8.6 Legacy Compliant] net: sched: sch_qfq: Fix UAF in qfq_dequeue()

[gvrose8192]

jira VULN-8858
cve CVE-2023-4921

Similar to previous PRs in this series such as #116

Builds and Loads

no .config file found, moving on
[TIMER]{MRPROPER}: 0s
x86_64 architecture detected, copying config
'configs/kernel-4.18.0-x86_64.config' -> '.config'
Setting Local Version for build
CONFIG_LOCALVERSION="-gvrose_fips-legacy-8-compliant_4.18.0-425.13.1"
Making olddefconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf  --olddefconfig Kconfig
#
# configuration written to .config
#
Starting Build
scripts/kconfig/conf  --syncconfig Kconfig
  SYSTBL  arch/x86/include/generated/asm/syscalls_32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_32_ia32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_64_x32.h

[SNIP]

  INSTALL sound/x86/snd-hdmi-lpe-audio.ko
  INSTALL sound/xen/snd_xen_front.ko
  INSTALL virt/lib/irqbypass.ko
  DEPMOD  4.18.0-gvrose_fips-legacy-8-compliant_4.18.0-425.13.1+
[TIMER]{MODULES}: 83s
Making Install
sh ./arch/x86/boot/install.sh 4.18.0-gvrose_fips-legacy-8-compliant_4.18.0-425.13.1+ arch/x86/boot/bzImage \
        System.map "/boot"
[TIMER]{INSTALL}: 30s
Checking kABI
Checking kABI
kABI check passed
Setting Default Kernel to /boot/vmlinuz-4.18.0-gvrose_fips-legacy-8-compliant_4.18.0-425.13.1+ and Index to 0
Hopefully Grub2.0 took everything ... rebooting after time metrices
[TIMER]{MRPROPER}: 0s
[TIMER]{BUILD}: 4807s
[TIMER]{MODULES}: 83s
[TIMER]{INSTALL}: 30s
[TIMER]{TOTAL} 4937s
Rebooting in 10 seconds

[gvrose8192@auto-kernel-test-fips86 ~]$ uname -a
Linux auto-kernel-test-fips86 4.18.0-gvrose_fips-legacy-8-compliant_4.18.0-425.13.1+ #1 SMP Fri Feb 21 23:27:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Kernel selftests results included in the build log and show nothing of interest.

lts-fips-legacy-8_6-build.log

[bmastbergen]

🥌