==================================================================
BUG: KASAN: use-after-free in __nft_trace_packet+0x137/0x150 net/netfilter/nf_tables_core.c:30
Read of size 2 at addr ffff88804c026bc0 by task syz.7.1113/9762
CPU: 0 PID: 9762 Comm: syz.7.1113 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
__nft_trace_packet+0x137/0x150 net/netfilter/nf_tables_core.c:30
nft_trace_verdict net/netfilter/nf_tables_core.c:110 [inline]
nft_do_chain+0x1453/0x16b0 net/netfilter/nf_tables_core.c:256
nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x26b/0x410 include/linux/netfilter.h:300
NF_HOOK+0x364/0x410 include/linux/netfilter.h:302
__netif_receive_skb_one_core net/core/dev.c:5524 [inline]
__netif_receive_skb+0x1c6/0x530 net/core/dev.c:5638
process_backlog+0x363/0x7f0 net/core/dev.c:6515
__napi_poll+0xc7/0x440 net/core/dev.c:7074
napi_poll net/core/dev.c:7141 [inline]
net_rx_action+0x617/0xda0 net/core/dev.c:7231
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 31 60 f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ee 48 19 f7 48 89 df e8 46 9d 1a f7 e8 31 5d 3d f7 fb bf 01 00 00 00 16 e0 0d f7 65 8b 05 87 b0 b8 75 85 c0 74 02 5b c3 e8 54 cd b6
RSP: 0018:ffffc90003b1f2e8 EFLAGS: 00000282
RAX: d58433c5c43aa900 RBX: ffff88806785cdf8 RCX: ffffffff96a97f03
RDX: dffffc0000000000 RSI: ffffffff8aab2b60 RDI: 0000000000000001
RBP: ffff88806785cdf0 R08: ffffffff81871c90 R09: ffffed100cf0b9c0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea0001597c80
R13: 00fff00000080017 R14: ffffea0001597c88 R15: ffffea0001597c80
spin_unlock_irq include/linux/spinlock.h:413 [inline]
delete_from_page_cache+0x12e/0x190 mm/filemap.c:267
truncate_inode_page+0x8d/0xb0 mm/truncate.c:219
shmem_undo_range+0x535/0x1b50 mm/shmem.c:960
shmem_truncate_range mm/shmem.c:1063 [inline]
shmem_evict_inode+0x21b/0xa00 mm/shmem.c:1145
evict+0x529/0x930 fs/inode.c:647
__dentry_kill+0x436/0x650 fs/dcache.c:586
dentry_kill+0xbb/0x290 fs/dcache.c:-1
dput+0xd8/0x1a0 fs/dcache.c:893
__fput+0x636/0x8e0 fs/file_table.c:319
task_work_run+0x129/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x6a3/0x2480 kernel/exit.c:874
do_group_exit+0x144/0x310 kernel/exit.c:996
get_signal+0xc66/0x14e0 kernel/signal.c:2900
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
exc_page_fault+0x342/0x700 arch/x86/mm/fault.c:1504
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f9e41097757
Code: Unable to access opcode bytes at RIP 0x7f9e4109772d.
RSP: 002b:00007f9e3f020120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f9e411d6169
RDX: 00007f9e3f020140 RSI: 00007f9e3f020270 RDI: 000000000000000b
RBP: 00007f9e41257990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9e413eefa0 R15: 00007ffc754e8e88
Allocated by task 9762:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
__alloc_skb+0xdd/0x590 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
synproxy_send_client_synack+0x1b6/0xf20 net/netfilter/nf_synproxy_core.c:482
nft_synproxy_eval_v4+0x3c6/0x610 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x359/0xa60 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
nft_do_chain+0x467/0x16b0 net/netfilter/nf_tables_core.c:238
nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x26b/0x410 include/linux/netfilter.h:300
NF_HOOK+0x364/0x410 include/linux/netfilter.h:302
__netif_receive_skb_one_core net/core/dev.c:5524 [inline]
__netif_receive_skb+0x1c6/0x530 net/core/dev.c:5638
process_backlog+0x363/0x7f0 net/core/dev.c:6515
__napi_poll+0xc7/0x440 net/core/dev.c:7074
napi_poll net/core/dev.c:7141 [inline]
net_rx_action+0x617/0xda0 net/core/dev.c:7231
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
Freed by task 9762:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
nft_synproxy_eval_v4+0x3ce/0x610 net/netfilter/nft_synproxy.c:60
nft_synproxy_do_eval+0x359/0xa60 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
nft_do_chain+0x467/0x16b0 net/netfilter/nf_tables_core.c:238
nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x26b/0x410 include/linux/netfilter.h:300
NF_HOOK+0x364/0x410 include/linux/netfilter.h:302
__netif_receive_skb_one_core net/core/dev.c:5524 [inline]
__netif_receive_skb+0x1c6/0x530 net/core/dev.c:5638
process_backlog+0x363/0x7f0 net/core/dev.c:6515
__napi_poll+0xc7/0x440 net/core/dev.c:7074
napi_poll net/core/dev.c:7141 [inline]
net_rx_action+0x617/0xda0 net/core/dev.c:7231
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
The buggy address belongs to the object at ffff88804c026b40
which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 128 bytes inside of
232-byte region [ffff88804c026b40, ffff88804c026c28)
The buggy address belongs to the page:
page:ffffea0001300980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c026
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888144bf1140
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 9762, ts 389182806308, free_ts 383682133686
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
__alloc_pages+0x272/0x700 mm/page_alloc.c:5466
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
skb_clone+0x1bb/0x350 net/core/skbuff.c:1523
dev_queue_xmit_nit+0x2d6/0xae0 net/core/dev.c:2341
xmit_one net/core/dev.c:3643 [inline]
dev_hard_start_xmit+0x137/0x7a0 net/core/dev.c:3664
__dev_queue_xmit+0x1c8e/0x32b0 net/core/dev.c:4287
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip_finish_output2+0xcd7/0x11a0 net/ipv4/ip_output.c:228
synproxy_send_client_synack+0x8b4/0xf20 net/netfilter/nf_synproxy_core.c:506
nft_synproxy_eval_v4+0x3c6/0x610 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x359/0xa60 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
nft_do_chain+0x467/0x16b0 net/netfilter/nf_tables_core.c:238
nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc_trace+0xfb/0x290 mm/slub.c:3245
kmalloc include/linux/slab.h:604 [inline]
usb_control_msg+0xb7/0x4c0 drivers/usb/core/message.c:143
usb_clear_port_feature drivers/usb/core/hub.c:439 [inline]
hub_port_reset+0x53a/0x1dd0 drivers/usb/core/hub.c:3035
hub_port_init+0x266/0x28c0 drivers/usb/core/hub.c:4838
hub_port_connect drivers/usb/core/hub.c:5396 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5607 [inline]
port_event drivers/usb/core/hub.c:5753 [inline]
hub_event+0x28ed/0x54c0 drivers/usb/core/hub.c:5835
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
Memory state around the buggy address:
ffff88804c026a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
ffff88804c026b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88804c026b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804c026c00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
ffff88804c026c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 31 60 f6 xor %esp,-0xa(%rax)
3: ff 90 53 48 89 fb call *-0x476b7ad(%rax)
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 ee 48 19 f7 call 0xf7194905
17: 48 89 df mov %rbx,%rdi
1a: e8 46 9d 1a f7 call 0xf71a9d65
1f: e8 31 5d 3d f7 call 0xf73d5d55
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 16 e0 0d f7 call 0xf70de045 <-- trapping instruction
2f: 65 8b 05 87 b0 b8 75 mov %gs:0x75b8b087(%rip),%eax # 0x75b8b0bd
36: 85 c0 test %eax,%eax
38: 74 02 je 0x3c
3a: 5b pop %rbx
3b: c3 ret
3c: e8 .byte 0xe8
3d: 54 push %rsp
3e: cd b6 int $0xb6