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android_kernel_xiaomi_sm8450/kernel
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Waiman Long ab8b397d59 padata: Fix possible divide-by-0 panic in padata_mt_helper() 
commit 6d45e1c948a8b7ed6ceddb14319af69424db730c upstream.

We are hit with a not easily reproducible divide-by-0 panic in padata.c at
bootup time.

  [   10.017908] Oops: divide error: 0000 1 PREEMPT SMP NOPTI
  [   10.017908] CPU: 26 PID: 2627 Comm: kworker/u1666:1 Not tainted 6.10.0-15.el10.x86_64 #1
  [   10.017908] Hardware name: Lenovo ThinkSystem SR950 [7X12CTO1WW]/[7X12CTO1WW], BIOS [PSE140J-2.30] 07/20/2021
  [   10.017908] Workqueue: events_unbound padata_mt_helper
  [   10.017908] RIP: 0010:padata_mt_helper+0x39/0xb0
    :
  [   10.017963] Call Trace:
  [   10.017968]  <TASK>
  [   10.018004]  ? padata_mt_helper+0x39/0xb0
  [   10.018084]  process_one_work+0x174/0x330
  [   10.018093]  worker_thread+0x266/0x3a0
  [   10.018111]  kthread+0xcf/0x100
  [   10.018124]  ret_from_fork+0x31/0x50
  [   10.018138]  ret_from_fork_asm+0x1a/0x30
  [   10.018147]  </TASK>

Looking at the padata_mt_helper() function, the only way a divide-by-0
panic can happen is when ps->chunk_size is 0.  The way that chunk_size is
initialized in padata_do_multithreaded(), chunk_size can be 0 when the
min_chunk in the passed-in padata_mt_job structure is 0.

Fix this divide-by-0 panic by making sure that chunk_size will be at least
1 no matter what the input parameters are.

Link: https://lkml.kernel.org/r/20240806174647.1050398-1-longman@redhat.com
Fixes: 004ed42638 ("padata: add basic support for multithreaded jobs")
Signed-off-by: Waiman Long <longman@redhat.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Waiman Long <longman@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-19 05:41:20 +02:00
..
bpf bpf: Eliminate remaining "make W=1" warnings in kernel/bpf/btf.o 2024-08-19 05:40:48 +02:00
cgroup sched/fair: Allow disabling sched_balance_newidle with sched_relax_domain_level 2024-06-16 13:32:15 +02:00
configs
debug kdb: Use the passed prompt in kdb_position_cursor() 2024-08-19 05:41:03 +02:00
dma dma: fix call order in dmam_free_coherent 2024-08-19 05:41:04 +02:00
entry entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set 2023-01-04 11:39:22 +01:00
events perf: Prevent passing zero nr_pages to rb_alloc_aux() 2024-08-19 05:40:46 +02:00
futex futex: Don't include process MM in futex key on no-MMU 2023-11-20 11:06:44 +01:00
gcov gcov: add support for GCC 14 2024-07-05 09:12:41 +02:00
irq genirq/irqdesc: Honor caller provided affinity in alloc_desc() 2024-08-19 05:41:19 +02:00
kcsan kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures 2023-07-27 08:43:57 +02:00
livepatch kallsyms: refactor {,module_}kallsyms_on_each_symbol 2024-06-21 14:52:58 +02:00
locking lockdep: Fix block chain corruption 2023-12-08 08:46:09 +01:00
power PM: suspend: Set mem_sleep_current during kernel command line setup 2024-04-13 12:58:13 +02:00
printk printk: Update @console_may_schedule in console_trylock_spinning() 2024-04-13 12:58:54 +02:00
rcu rcutorture: Fix rcu_torture_fwd_cb_cr() data race 2024-08-19 05:41:12 +02:00
sched sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime 2024-08-19 05:41:14 +02:00
time ntp: Safeguard against time_constant overflow 2024-08-19 05:41:18 +02:00
trace tracing: Fix overflow in get_free_elt() 2024-08-19 05:41:20 +02:00
.gitignore kbuild: update config_data.gz only when the content of .config is changed 2021-05-11 14:47:37 +02:00
acct.c acct: fix potential integer overflow in encode_comp_t() 2023-01-14 10:16:14 +01:00
async.c async: Introduce async_schedule_dev_nocall() 2024-02-23 08:41:53 +01:00
audit_fsnotify.c fsnotify: make allow_dups a property of the group 2024-06-21 14:53:39 +02:00
audit_tree.c fsnotify: pass flags argument to fsnotify_alloc_group() 2024-06-21 14:53:39 +02:00
audit_watch.c fsnotify: pass flags argument to fsnotify_alloc_group() 2024-06-21 14:53:39 +02:00
audit.c audit: Send netlink ACK before setting connection in auditd_set 2024-02-23 08:42:03 +01:00
audit.h audit: log AUDIT_TIME_* records only from rules 2022-04-08 14:40:00 +02:00
auditfilter.c ima: Avoid blocking in RCU read-side critical section 2024-07-18 13:05:44 +02:00
auditsc.c audit: fix possible soft lockup in __audit_inode_child() 2023-09-19 12:20:13 +02:00
backtracetest.c
bounds.c bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS 2024-05-02 16:23:46 +02:00
capability.c LSM: Signal to SafeSetID when setting group IDs 2020-10-13 09:17:34 -07:00
compat.c sched_getaffinity: don't assume 'cpumask_size()' is fully initialized 2023-04-05 11:23:45 +02:00
configs.c
context_tracking.c
cpu_pm.c PM: cpu: Make notifier chain use a raw_spinlock_t 2021-09-15 09:50:40 +02:00
cpu.c cpu: Re-enable CPU mitigations by default for !X86 architectures 2024-05-02 16:23:44 +02:00
crash_core.c crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo 2021-06-23 14:42:52 +02:00
crash_dump.c
cred.c cred: switch to using atomic_long_t 2023-12-20 15:44:30 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c mm: optimize the redundant loop of mm_update_owner_next() 2024-07-18 13:05:42 +02:00
extable.c
fail_function.c kernel/fail_function: fix memory leak with using debugfs_lookup() 2023-03-11 16:40:18 +01:00
fork.c exec: Simplify unshare_files 2024-06-21 14:52:47 +02:00
freezer.c Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing" 2021-04-07 15:00:14 +02:00
gen_kheaders.sh kheaders: explicitly define file modes for archived headers 2024-07-05 09:12:44 +02:00
groups.c LSM: Signal to SafeSetID when setting group IDs 2020-10-13 09:17:34 -07:00
hung_task.c kernel/hung_task.c: make type annotations consistent 2020-11-02 12:14:19 -08:00
iomem.c
irq_work.c
jump_label.c jump_label: Fix jump_label_text_reserved() vs __init 2021-07-20 16:05:58 +02:00
kallsyms.c kallsyms: only build {,module_}kallsyms_on_each_symbol when required 2024-06-21 14:52:58 +02:00
kcmp.c kcmp: In get_file_raw_ptr use task_lookup_fd_rcu 2024-06-21 14:52:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c kcov: don't lose track of remote references during softirqs 2024-07-05 09:12:41 +02:00
kexec_core.c kexec: fix a memory leak in crash_shrink_memory() 2023-07-27 08:43:40 +02:00
kexec_elf.c
kexec_file.c kexec: support purgatories with .text.hot sections 2023-06-21 15:45:37 +02:00
kexec_internal.h panic, kexec: make __crash_kexec() NMI safe 2023-04-20 12:10:29 +02:00
kexec.c panic, kexec: make __crash_kexec() NMI safe 2023-04-20 12:10:29 +02:00
kheaders.c kheaders: Use array declaration instead of char 2023-05-17 11:47:33 +02:00
kmod.c
kprobes.c kprobes: Fix to check symbol prefixes correctly 2024-08-19 05:41:17 +02:00
ksysfs.c kexec: turn all kexec_mutex acquisitions into trylocks 2023-04-20 12:10:29 +02:00
kthread.c exit: Implement kthread_exit 2024-06-21 14:53:28 +02:00
latencytop.c
Makefile futex: Move to kernel/futex/ 2023-01-14 10:15:20 +01:00
module_signature.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
module_signing.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
module-internal.h
module.c NFSD: Remove svc_serv_ops::svo_module 2024-06-21 14:53:37 +02:00
notifier.c
nsproxy.c
padata.c padata: Fix possible divide-by-0 panic in padata_mt_helper() 2024-08-19 05:41:20 +02:00
panic.c panic: Flush kernel log buffer at the end 2024-04-13 12:59:40 +02:00
params.c params: lift param_set_uint_minmax to common code 2024-06-16 13:32:26 +02:00
pid_namespace.c zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING 2024-07-05 09:12:33 +02:00
pid.c kernel/pid.c: implement additional checks upon pidfd_create() parameters 2024-06-21 14:53:17 +02:00
profile.c profiling: fix shift too large makes kernel panic 2022-08-21 15:16:05 +02:00
ptrace.c ptrace: Reimplement PTRACE_KILL by always sending SIGKILL 2022-06-09 10:20:49 +02:00
range.c kernel.h: split out min()/max() et al. helpers 2020-10-16 11:11:19 -07:00
reboot.c kernel/reboot: emergency_restart: Set correct system_state 2023-11-28 16:54:58 +00:00
regset.c
relay.c relayfs: fix out-of-bounds access in relay_file_read 2023-05-17 11:47:34 +02:00
resource.c dax/kmem: Fix leak of memory-hotplug resources 2023-03-11 16:40:04 +01:00
rseq.c rseq: Remove broken uapi field layout on 32-bit little endian 2022-04-08 14:40:03 +02:00
scftorture.c scftorture: Forgive memory-allocation failure if KASAN 2023-09-23 11:01:05 +02:00
scs.c
seccomp.c seccomp: Invalidate seccomp mode to catch death failures 2024-03-01 13:16:46 +01:00
signal.c kernel: rerun task_work while freezing in get_signal() 2024-08-19 05:41:03 +02:00
smp.c smp: Fix offline cpu check in flush_smp_call_function_queue() 2022-04-20 09:23:29 +02:00
smpboot.c sched/core: Initialize the idle task with preemption disabled 2021-07-14 16:55:50 +02:00
smpboot.h
softirq.c
stackleak.c gcc-plugins/stackleak: Use noinstr in favor of notrace 2022-02-23 12:01:00 +01:00
stacktrace.c
static_call.c static_call: Fix unused variable warn w/o MODULE 2021-09-08 08:49:00 +02:00
stop_machine.c stop_machine, rcu: Mark functions as notrace 2020-10-26 12:12:27 +01:00
sys_ni.c syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-07-05 09:12:55 +02:00
sys.c fs: add file and path permissions helpers 2024-06-21 14:52:58 +02:00
sysctl-test.c
sysctl.c sysctl: introduce new proc handler proc_dobool 2024-06-21 14:53:18 +02:00
task_work.c task_work: Introduce task_work_cancel() again 2024-08-19 05:40:57 +02:00
taskstats.c taskstats: move specifying netlink policy back to ops 2020-10-02 19:11:12 -07:00
test_kprobes.c
torture.c torture: Fix hang during kthread shutdown phase 2023-08-30 16:23:17 +02:00
tracepoint.c tracepoint: Use rcu get state and cond sync for static call updates 2021-09-03 10:09:30 +02:00
tsacct.c taskstats: Cleanup the use of task->exit_code 2022-01-27 10:54:33 +01:00
ucount.c fanotify: configurable limits via sysfs 2024-06-21 14:53:06 +02:00
uid16.c
uid16.h
umh.c usermodehelper: reset umask to default before executing user process 2020-10-06 10:31:52 -07:00
up.c smp: Fix smp_call_function_single_async prototype 2021-05-14 09:50:46 +02:00
user_namespace.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
user-return-notifier.c
user.c
usermode_driver.c bpf: Fix umd memory leak in copy_process() 2021-03-30 14:32:03 +02:00
utsname_sysctl.c
utsname.c
watch_queue.c watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths 2023-03-17 08:45:13 +01:00
watchdog_hld.c watchdog/perf: properly initialize the turbo mode timestamp and rearm counter 2024-08-19 05:41:01 +02:00
watchdog.c watchdog: move softlockup_panic back to early_param 2023-11-28 16:54:56 +00:00
workqueue_internal.h
workqueue.c Revert "workqueue: remove unused cancel_work()" 2023-12-08 08:46:13 +01:00