==================================================================
BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel/softirq.c:954
Read of size 8 at addr ffff888035ee7158 by task kworker/1:5/20812
CPU: 1 UID: 0 PID: 20812 Comm: kworker/1:5 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events request_firmware_work_func
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
tasklet_action_common+0x103/0x490 kernel/softirq.c:954
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 cd 4f ba f5 f7 c3 00 02 00 00 74 05 e8 60 9d e6 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 04 4d ab f5 65 48 8b 05 4c f0 ab 07 48 85 c0 74 18 5b 41 5e e9
RSP: 0018:ffffc900043e7540 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000006 RSI: ffffffff8e416437 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff907a647f R09: 1ffffffff20f4c8f
R10: dffffc0000000000 R11: fffffbfff20f4c90 R12: ffff88823bb2ec70
R13: 0000000000000000 R14: ffffffff8f5a0af0 R15: ffff888041646b60
stack_depot_save_flags+0x404/0x7f0 lib/stackdepot.c:728
kasan_save_stack mm/kasan/common.c:58 [inline]
kasan_save_track+0x4f/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:264 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6508 [inline]
kfree+0x1c5/0x650 mm/slub.c:6801
ath9k_htc_probe_device+0x11a9/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:978
ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532
ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_usb.c:1255
request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:1164
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 20812:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
ath9k_init_wmi+0x4f/0x2b0 drivers/net/wireless/ath/ath9k/wmi.c:95
ath9k_htc_probe_device+0x1e5/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:956
ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532
ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_usb.c:1255
request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:1164
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888035ee7000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 344 bytes inside of
freed 2048-byte region [ffff888035ee7000, ffff888035ee7800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888035ee3000 pfn:0x35ee0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801b042000 ffffea0000990410 ffffea0001fb4210
raw: ffff888035ee3000 0000000000080006 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b042000 ffffea0000990410 ffffea0001fb4210
head: ffff888035ee3000 0000000000080006 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5624, tgid 5624 (syz-executor), ts 74121111498
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab+0x7d/0x620 mm/slub.c:3462
new_slab mm/slub.c:3513 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7417
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_node_track_caller_noprof+0x548/0x720 mm/slub.c:5545
kmalloc_reserve net/core/skbuff.c:637 [inline]
pskb_expand_head+0x22c/0x13a0 net/core/skbuff.c:2315
netlink_trim+0x1b3/0x2c0 net/netlink/af_netlink.c:1319
netlink_broadcast_filtered+0x6d/0xea0 net/netlink/af_netlink.c:1537
nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
nlmsg_multicast include/net/netlink.h:1184 [inline]
nlmsg_notify+0xe3/0x1a0 net/netlink/af_netlink.c:2618
rtnl_notify net/core/rtnetlink.c:994 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:4614 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4630 [inline]
rtnetlink_event+0x224/0x270 net/core/rtnetlink.c:7197
notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
call_netdevice_notifiers net/core/dev.c:2327 [inline]
netif_set_mac_address+0x393/0x4d0 net/core/dev.c:10099
do_setlink+0x9ad/0x4670 net/core/rtnetlink.c:3223
rtnl_changelink net/core/rtnetlink.c:3910 [inline]
__rtnl_newlink net/core/rtnetlink.c:4081 [inline]
rtnl_newlink+0x15a3/0x1c30 net/core/rtnetlink.c:4220
page last free pid 5629 tgid 5629 ts 73976092565 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
__slab_free+0x274/0x2c0 mm/slub.c:5823
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_noprof+0x307/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
ipt_alloc_initial_table+0x6b/0x6a0 net/ipv4/netfilter/ip_tables.c:36
iptable_security_table_init+0x1b/0x70 net/ipv4/netfilter/iptable_security.c:43
xt_find_table_lock+0x311/0x400 net/netfilter/x_tables.c:1353
xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1378
get_info net/ipv4/netfilter/ip_tables.c:961 [inline]
do_ipt_get_ctl+0x77f/0x1300 net/ipv4/netfilter/ip_tables.c:1660
nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x19e/0x230 net/ipv4/ip_sockglue.c:1777
do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2503
__sys_getsockopt net/socket.c:2534 [inline]
__do_sys_getsockopt net/socket.c:2541 [inline]
__se_sys_getsockopt net/socket.c:2538 [inline]
__x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2538
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
Memory state around the buggy address:
ffff888035ee7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888035ee7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888035ee7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888035ee7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888035ee7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: e8 cd 4f ba f5 call 0xf5ba4fd2
5: f7 c3 00 02 00 00 test $0x200,%ebx
b: 74 05 je 0x12
d: e8 60 9d e6 f5 call 0xf5e69d72
12: 9c pushf
13: 58 pop %rax
14: a9 00 02 00 00 test $0x200,%eax
19: 75 29 jne 0x44
1b: f7 c3 00 02 00 00 test $0x200,%ebx
21: 74 01 je 0x24
23: fb sti
24: bf 01 00 00 00 mov $0x1,%edi
* 29: e8 04 4d ab f5 call 0xf5ab4d32 <-- trapping instruction
2e: 65 48 8b 05 4c f0 ab mov %gs:0x7abf04c(%rip),%rax # 0x7abf082
35: 07
36: 48 85 c0 test %rax,%rax
39: 74 18 je 0x53
3b: 5b pop %rbx
3c: 41 5e pop %r14
3e: e9 .byte 0xe9