==================================================================
BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel/softirq.c:954
Read of size 8 at addr ffff88802a395158 by task kworker/1:4/15013
CPU: 1 UID: 0 PID: 15013 Comm: kworker/1:4 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:sta_info_stop+0x0/0x40 net/mac80211/sta_info.c:1700
Code: 89 d9 80 e1 07 38 c1 0f 8c 7a ff ff ff 48 89 df e8 15 40 e7 f6 e9 6d ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 53 48 89 fb e8 03 2f 77 f6 48 8d bb 48 0c 00 00 e8 17
RSP: 0018:ffffc9000465f840 EFLAGS: 00000292
RAX: 0000000000000000 RBX: ffff8880348f0fa0 RCX: ffff888028e2be80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880348f0fa0
RBP: ffffc9000465f9f8 R08: ffffc9000465f7af R09: 0000000000000000
R10: ffffc9000465f7a0 R11: fffff520008cbef6 R12: dffffc0000000000
R13: 00000000ffffff92 R14: ffff8880348f3158 R15: dffffc0000000000
ieee80211_free_hw+0x54/0x3d0 net/mac80211/main.c:1769
ath9k_htc_probe_device+0x232/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:980
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 15013:
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
Freed by task 15013:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/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:6509 [inline]
kfree+0x1c5/0x650 mm/slub.c:6802
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
The buggy address belongs to the object at ffff88802a395000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 344 bytes inside of
freed 2048-byte region [ffff88802a395000, ffff88802a395800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802a397000 pfn:0x2a390
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 ffffea0001460410 ffffea0000cc1610
raw: ffff88802a397000 0000000000080006 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b042000 ffffea0001460410 ffffea0000cc1610
head: ffff88802a397000 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11998, tgid 11995 (syz.1.1673), ts 518241360873
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:7418
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]
__kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
br_vlan_add+0x22d/0x1060 net/bridge/br_vlan.c:790
__vlan_add+0x46b/0x29f0 net/bridge/br_vlan.c:297
nbp_vlan_add+0x27c/0xb20 net/bridge/br_vlan.c:1344
br_vlan_info+0x100/0x470 net/bridge/br_netlink.c:711
br_process_vlan_info+0x61f/0x8b0 net/bridge/br_netlink.c:774
br_afspec+0x3a5/0x600 net/bridge/br_netlink.c:842
br_setlink+0x34f/0x830 net/bridge/br_netlink.c:1159
rtnl_bridge_setlink+0x5b6/0x7e0 net/core/rtnetlink.c:5712
rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7146
page last free pid 11423 tgid 11423 ts 473859523188 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_pages_ok+0xb6c/0xc60 mm/page_alloc.c:1596
netif_free_rx_queues net/core/dev.c:11303 [inline]
free_netdev+0x226/0x6e0 net/core/dev.c:12320
netdev_run_todo+0xecc/0x1060 net/core/dev.c:11856
tun_detach drivers/net/tun.c:656 [inline]
tun_chr_close+0x13c/0x1c0 drivers/net/tun.c:3587
__fput+0x418/0xa50 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802a395000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a395080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802a395100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802a395180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a395200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 d9 mov %ebx,%ecx
2: 80 e1 07 and $0x7,%cl
5: 38 c1 cmp %al,%cl
7: 0f 8c 7a ff ff ff jl 0xffffff87
d: 48 89 df mov %rbx,%rdi
10: e8 15 40 e7 f6 call 0xf6e7402a
15: e9 6d ff ff ff jmp 0xffffff87
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 90 nop
29: 90 nop
* 2a: 0f 1f 40 d6 nopl -0x2a(%rax) <-- trapping instruction
2e: 53 push %rbx
2f: 48 89 fb mov %rdi,%rbx
32: e8 03 2f 77 f6 call 0xf6772f3a
37: 48 8d bb 48 0c 00 00 lea 0xc48(%rbx),%rdi
3e: e8 .byte 0xe8
3f: 17 (bad)