==================================================================
BUG: KASAN: use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
BUG: KASAN: use-after-free in netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
BUG: KASAN: use-after-free in __linkwatch_run_queue+0x883/0x8a0 net/core/link_watch.c:245
Read of size 8 at addr ffff8880330a0008 by task kworker/u8:13/6544
CPU: 0 UID: 0 PID: 6544 Comm: kworker/u8:13 Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound linkwatch_event
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
__linkwatch_run_queue+0x883/0x8a0 net/core/link_watch.c:245
linkwatch_event+0x8f/0xc0 net/core/link_watch.c:304
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880330a1800 pfn:0x330a0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffff8880b853ffc0 ffff8880b853ffc0 0000000000000000
raw: ffff8880330a1800 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 5825, tgid 5825 (syz-executor), ts 116392515523, free_ts 317518247787
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1714
prep_new_page mm/page_alloc.c:1722 [inline]
get_page_from_freelist+0x135c/0x3950 mm/page_alloc.c:3684
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4974
__alloc_pages_noprof+0xb/0x1b0 mm/page_alloc.c:5008
__alloc_pages_node_noprof include/linux/gfp.h:284 [inline]
alloc_pages_node_noprof include/linux/gfp.h:311 [inline]
___kmalloc_large_node+0x84/0x1e0 mm/slub.c:4271
__kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4299
__do_kmalloc_node mm/slub.c:4315 [inline]
__kvmalloc_node_noprof.cold+0xb/0x65 mm/slub.c:5012
alloc_netdev_mqs+0xd2/0x1570 net/core/dev.c:11606
ieee80211_if_add+0x18a/0x1a40 net/mac80211/iface.c:2116
ieee80211_register_hw+0x3943/0x4140 net/mac80211/main.c:1606
mac80211_hwsim_new_radio+0x3034/0x54d0 drivers/net/wireless/virtual/mac80211_hwsim.c:5559
hwsim_new_radio_nl+0xb51/0x12c0 drivers/net/wireless/virtual/mac80211_hwsim.c:6243
genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x16d/0x440 net/netlink/af_netlink.c:2534
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
page last free pid 2986 tgid 2986 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0x7f8/0x1180 mm/page_alloc.c:2721
__folio_put+0x329/0x450 mm/swap.c:112
device_release+0xa4/0x240 drivers/base/core.c:2568
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1e7/0x5a0 lib/kobject.c:737
netdev_run_todo+0x7e9/0x1320 net/core/dev.c:11307
ieee80211_unregister_hw+0x158/0x3a0 net/mac80211/main.c:1693
mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5665 [inline]
hwsim_exit_net+0x3ac/0x7d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6545
ops_exit_list+0xb3/0x180 net/core/net_namespace.c:172
cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88803309ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803309ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880330a0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8880330a0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8880330a0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Oops: general protection fault, probably for non-canonical address 0xe0aa3c4f80000365: 0000 [#1] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x0552027c00001b28-0x0552027c00001b2f]
CPU: 1 UID: 0 PID: 6544 Comm: kworker/u8:13 Tainted: G B 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound linkwatch_event
RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
RIP: 0010:netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
RIP: 0010:__linkwatch_run_queue+0x654/0x8a0 net/core/link_watch.c:245
Code: 80 3c 02 00 0f 85 4a 02 00 00 4c 8b a3 68 f9 ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 a8 02 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 16 02 00 00 49 83 bc 24 a8 02 00 00 00 0f 84 ad
RSP: 0018:ffffc9000429fb50 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffff8880330a06a0 RCX: ffffffff817abc7f
RDX: 00aa404f80000365 RSI: ffffffff8220a137 RDI: 0552027c00001b2f
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 303178302f303f20 R12: 0552027c00001887
R13: 0000000000000063 R14: 0000000000000000 R15: ffffc9000429fb90
FS: 0000000000000000(0000) GS:ffff888124aa5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd0fff8 CR3: 0000000020f5c000 CR4: 0000000000350ef0
Call Trace:
linkwatch_event+0x8f/0xc0 net/core/link_watch.c:304
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline]
RIP: 0010:netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
RIP: 0010:__linkwatch_run_queue+0x654/0x8a0 net/core/link_watch.c:245
Code: 80 3c 02 00 0f 85 4a 02 00 00 4c 8b a3 68 f9 ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 a8 02 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 16 02 00 00 49 83 bc 24 a8 02 00 00 00 0f 84 ad
RSP: 0018:ffffc9000429fb50 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffff8880330a06a0 RCX: ffffffff817abc7f
RDX: 00aa404f80000365 RSI: ffffffff8220a137 RDI: 0552027c00001b2f
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 303178302f303f20 R12: 0552027c00001887
R13: 0000000000000063 R14: 0000000000000000 R15: ffffc9000429fb90
FS: 0000000000000000(0000) GS:ffff888124aa5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000027d99000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
4: 0f 85 4a 02 00 00 jne 0x254
a: 4c 8b a3 68 f9 ff ff mov -0x698(%rbx),%r12
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 49 8d bc 24 a8 02 00 lea 0x2a8(%r12),%rdi
22: 00
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 16 02 00 00 jne 0x24a
34: 49 83 bc 24 a8 02 00 cmpq $0x0,0x2a8(%r12)
3b: 00 00
3d: 0f .byte 0xf
3e: 84 .byte 0x84
3f: ad lods %ds:(%rsi),%eax