Breno Leitao 0143033dc2 workqueue: Fix wq->cpu_pwq leak in alloc_and_link_pwqs() WQ_UNBOUND path ...

For WQ_UNBOUND workqueues, alloc_and_link_pwqs() allocates wq->cpu_pwq
via alloc_percpu() and then calls apply_workqueue_attrs_locked(). On
failure it returns the error directly, bypassing the enomem: label
which holds the only free_percpu(wq->cpu_pwq) in this function.

The caller's error path kfree()s wq without touching wq->cpu_pwq,
leaking one percpu pointer table (nr_cpu_ids * sizeof(void *) bytes) per
failed call.

If kmemleak is enabled, we can see:

  unreferenced object (percpu) 0xc0fffa5b121048 (size 8):
    comm "insmod", pid 776, jiffies 4294682844
    backtrace (crc 0):
      pcpu_alloc_noprof+0x665/0xac0
      __alloc_workqueue+0x33f/0xa20
      alloc_workqueue_noprof+0x60/0x100

Route the error through the existing enomem: cleanup and any error
before this one.

Cc: stable@kernel.org
Fixes: 636b927eba ("workqueue: Make unbound workqueues to use per-cpu pool_workqueues")
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

2026-05-08 07:59:44 -10:00

..

bpf

Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

2026-04-17 15:58:22 -07:00

cgroup

Merge tag 'cgroup-for-7.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2026-04-27 16:51:27 -07:00

configs

Remove WARN_ALL_UNSEEDED_RANDOM kernel config option

2026-02-23 11:18:48 -08:00

debug

kgdb: update outdated references to kgdb_wait()

2026-04-21 16:41:54 +01:00

dma

Merge tag 'memblock-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

2026-04-18 11:29:14 -07:00

entry

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2026-04-14 16:48:56 -07:00

events

Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-15 12:59:16 -07:00

futex

Merge tag 'locking-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-04-14 12:36:25 -07:00

gcov

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-21 20:03:00 -08:00

irq

genirq/chip: Invoke add_interrupt_randomness() in handle_percpu_devid_irq()

2026-04-02 23:03:29 +02:00

kcsan

kcsan: test: Adjust "expect" allocation type for kmalloc_obj

2026-02-26 09:54:08 -08:00

livepatch

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

liveupdate

Merge tag 'mm-stable-2026-04-18-02-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-19 08:01:17 -07:00

locking

locking/mutex: Fix ww_mutex wait_list operations

2026-04-23 10:05:49 +02:00

module

module: Simplify warning on positive returns from module_init()

2026-04-04 00:04:48 +00:00

power

Merge branches 'pm-cpuidle', 'pm-opp' and 'pm-sleep'

2026-04-10 12:37:27 +02:00

printk

Merge branch 'rework/prb-fixes' into for-linus

2026-04-20 13:42:01 +02:00

rcu

Merge tag 'rcu.2026.03.31a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

2026-04-13 09:36:45 -07:00

sched

Merge tag 'trace-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2026-04-17 09:43:12 -07:00

time

clockevents: Add missing resets of the next_event_forced flag

2026-04-16 21:22:04 +02:00

trace

Merge tag 'trace-ring-buffer-v7.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2026-04-24 15:17:23 -07:00

unwind

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-21 20:03:00 -08:00

.gitignore

kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute

2025-06-24 20:30:37 +09:00

acct.c

Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2026-04-13 14:20:11 -07:00

async.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

audit_fsnotify.c

audit: widen ino fields to u64

2026-03-06 14:31:26 +01:00

audit_tree.c

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

audit_watch.c

audit: widen ino fields to u64

2026-03-06 14:31:26 +01:00

audit.c

audit: handle unknown status requests in audit_receive_msg()

2026-03-10 15:22:43 -04:00

audit.h

audit: widen ino fields to u64

2026-03-06 14:31:26 +01:00

auditfilter.c

audit: fix coding style issues

2026-03-05 22:16:08 -05:00

auditsc.c

audit: widen ino fields to u64

2026-03-06 14:31:26 +01:00

backtracetest.c

…

bounds.c

x86/asm: Remove ANNOTATE_DATA_SPECIAL usage

2025-12-03 16:53:19 +01:00

capability.c

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cfi.c

cfi: Move BPF CFI types and helpers to generic code

2025-07-31 18:23:53 -07:00

compat.c

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configs.c

…

context_tracking.c

context_tracking: Remove rcu_task_trace_heavyweight_{enter,exit}()

2026-01-01 16:39:46 +08:00

cpu_pm.c

syscore: Pass context data to callbacks

2025-11-14 10:01:52 +01:00

cpu.c

Merge tag 'spdx-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/spdx

2026-02-17 09:46:03 -08:00

crash_core_test.c

crash: add KUnit tests for crash_exclude_mem_range

2025-09-13 17:32:55 -07:00

crash_core.c

kernel/crash: remove inclusion of crypto/sha1.h

2026-03-27 21:19:46 -07:00

crash_dump_dm_crypt.c

crash_dump/dm-crypt: don't print in arch-specific code

2026-04-02 23:36:24 -07:00

crash_reserve.c

kernel/crash: remove inclusion of crypto/sha1.h

2026-03-27 21:19:46 -07:00

cred.c

cred: remove unused set_security_override_from_ctx()

2026-01-06 20:52:57 -05:00

delayacct.c

delayacct: fix uapi timespec64 definition

2026-02-08 00:13:32 -08:00

dma.c

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elfcorehdr.c

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exec_domain.c

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exit.c

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-16 20:11:56 -07:00

exit.h

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extable.c

…

fail_function.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

fork.c

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-16 20:11:56 -07:00

freezer.c

freezer: Clarify that only cgroup1 freezer uses PM freezer

2025-10-30 20:10:27 +01:00

gen_kheaders.sh

kheaders: make it possible to override TAR

2025-08-06 10:23:36 +09:00

groups.c

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21 01:02:28 -08:00

hung_task.c

hung_task: explicitly report I/O wait state in log output

2026-03-27 21:19:40 -07:00

iomem.c

…

irq_work.c

kernel: Use trace_call__##name() at guarded tracepoint call sites

2026-03-26 08:28:49 -04:00

jump_label.c

jump_label: use ATOMIC_INIT() for initialization of .enabled

2026-03-16 13:16:48 +01:00

kallsyms_internal.h

kallsyms: Get rid of kallsyms relative base

2026-01-22 15:58:22 -07:00

kallsyms_selftest.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

kallsyms_selftest.h

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kallsyms.c

Merge tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-02-12 12:13:01 -08:00

kcmp.c

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Kconfig.freezer

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Kconfig.hz

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Kconfig.kexec

liveupdate: kho: move to kernel/liveupdate

2025-11-27 14:24:33 -08:00

Kconfig.locks

…

Kconfig.preempt

sched: Further restrict the preemption modes

2026-01-08 12:43:57 +01:00

kcov.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

kexec_core.c

kernel/kexec: remove inclusion of crypto/hash.h

2026-03-27 21:19:46 -07:00

kexec_elf.c

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kexec_file.c

kexec: derive purgatory entry from symbol

2026-01-31 16:16:07 -08:00

kexec_internal.h

kexec: enable CMA based contiguous allocation

2025-08-02 12:01:38 -07:00

kexec.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

kheaders.c

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kprobes.c

kprobes: Remove unneeded warnings from __arm_kprobe_ftrace()

2026-03-13 23:15:26 +09:00

kstack_erase.c

sysctl: remove __user qualifier from stack_erasing_sysctl buffer argument

2025-11-27 15:44:53 +01:00

ksyms_common.c

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ksysfs.c

kernel: ksysfs: initialize kernel_kobj earlier

2026-04-03 19:39:52 +02:00

kthread.c

kthread: consolidate kthread exit paths to prevent use-after-free

2026-02-26 10:45:49 +01:00

latencytop.c

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Makefile

kcov: Enable context analysis

2026-01-05 16:43:34 +01:00

module_signature.c

module: Give 'enum pkey_id_type' a more specific name

2026-03-24 21:42:37 +00:00

notifier.c

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nscommon.c

nsfs: tighten permission checks for ns iteration ioctls

2026-02-27 22:00:08 +01:00

nsproxy.c

Merge tag 'vfs-7.1-rc1.mount.v2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2026-04-14 19:59:25 -07:00

nstree.c

nstree: tighten permission checks for listing

2026-02-27 22:00:11 +01:00

padata.c

padata: Put CPU offline callback in ONLINE section to allow failure

2026-03-22 11:17:59 +09:00

panic.c

kernel/panic: mark init_taint_buf as __initdata and panic instead of warning in alloc_taint_buf()

2026-03-27 21:19:33 -07:00

params.c

module: Clean up parse_args() arguments

2026-03-18 21:43:18 +00:00

pid_namespace.c

pid_namespace: allow opening pid_for_children before init was created

2026-03-20 14:44:26 +01:00

pid_sysctl.h

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pid.c

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-16 20:11:56 -07:00

profile.c

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ptrace.c

clone: add CLONE_AUTOREAP

2026-03-11 23:14:02 +01:00

range.c

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reboot.c

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21 01:02:28 -08:00

regset.c

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relay.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

resource_kunit.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

resource.c

PCI: Align head space better

2026-03-27 10:19:08 -05:00

rseq.c

rseq: slice ext: Ensure rseq feature size differs from original rseq size

2026-02-23 11:19:19 +01:00

scftorture.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

scs.c

scs: fix a wrong parameter in __scs_magic

2025-11-12 10:00:13 -08:00

seccomp.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

signal.c

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-16 20:11:56 -07:00

smp.c

Merge tag 'trace-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2026-04-17 09:43:12 -07:00

smpboot.c

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smpboot.h

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softirq.c

softirq: Prepare for deferred hrtimer rearming

2026-02-27 16:40:13 +01:00

stacktrace.c

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static_call_inline.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

static_call.c

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stop_machine.c

sched/core: Fix migrate_swap() vs. hotplug

2025-07-01 15:02:03 +02:00

sys_ni.c

rseq: Implement sys_rseq_slice_yield()

2026-01-22 11:11:17 +01:00

sys.c

prctl: cfi: change the branch landing pad prctl()s to be more descriptive

2026-04-04 18:40:58 -06:00

sysctl-test.c

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sysctl.c

sysctl: fix uninitialized variable in proc_do_large_bitmap

2026-03-26 09:32:19 +01:00

task_work.c

task_work: Fix NMI race condition

2025-10-29 10:29:54 +01:00

taskstats.c

taskstats: set version in TGID exit notifications

2026-04-15 02:15:02 -07:00

torture.c

torture: Avoid modulo-zero error in torture_hrtimeout_ns()

2026-03-30 15:48:14 -04:00

tracepoint.c

tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()

2026-04-14 05:17:02 -04:00

tsacct.c

tsacct: skip all kernel threads

2026-01-26 19:07:13 -08:00

ucount.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

uid16.c

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uid16.h

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umh.c

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21 01:02:28 -08:00

up.c

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user_namespace.c

Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses

2026-02-22 08:26:33 -08:00

user-return-notifier.c

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user.c

ns: drop custom reference count initialization for initial namespaces

2025-11-11 10:01:32 +01:00

utsname_sysctl.c

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utsname.c

Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2025-09-29 11:20:29 -07:00

vhost_task.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

vmcore_info.c

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-16 20:11:56 -07:00

watch_queue.c

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

watchdog_buddy.c

watchdog/hardlockup: improve buddy system detection timeliness

2026-03-27 21:19:47 -07:00

watchdog_perf.c

watchdog/hardlockup: simplify perf event probe and remove per-cpu dependency

2026-02-08 00:13:35 -08:00

watchdog.c

watchdog/hardlockup: improve buddy system detection timeliness

2026-03-27 21:19:47 -07:00

workqueue_internal.h

workqueue: Show in-flight work item duration in stall diagnostics

2026-03-05 07:27:48 -10:00

workqueue.c

workqueue: Fix wq->cpu_pwq leak in alloc_and_link_pwqs() WQ_UNBOUND path

2026-05-08 07:59:44 -10:00