================================================================== BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa0/0x6b0 kernel/bpf/devmap.c:667 Read of size 8 at addr ffff888124ff9880 by task kworker/0:8/9131 CPU: 0 PID: 9131 Comm: kworker/0:8 Tainted: G W 5.15.180-syzkaller-android13-5.15.180_r00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: mld mld_ifc_work Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 dev_map_generic_redirect+0xa0/0x6b0 kernel/bpf/devmap.c:667 xdp_do_generic_redirect_map net/core/filter.c:4177 [inline] xdp_do_generic_redirect+0x40e/0xa80 net/core/filter.c:4236 do_xdp_generic+0x516/0x7a0 net/core/dev.c:4950 __netif_receive_skb_core+0x12ac/0x2f10 net/core/dev.c:5355 __netif_receive_skb_one_core net/core/dev.c:5530 [inline] __netif_receive_skb+0x72/0x280 net/core/dev.c:5646 process_backlog+0x368/0x600 net/core/dev.c:6523 __napi_poll+0xbe/0x590 net/core/dev.c:7082 napi_poll net/core/dev.c:7149 [inline] net_rx_action+0x371/0x8e0 net/core/dev.c:7239 handle_softirqs+0x250/0x560 kernel/softirq.c:565 __do_softirq+0xb/0xd kernel/softirq.c:603 do_softirq+0xc6/0x120 kernel/softirq.c:452 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379 local_bh_enable+0x1f/0x30 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:818 [inline] ip6_finish_output2+0x10be/0x1760 net/ipv6/ip6_output.c:131 __ip6_finish_output+0x61e/0x7d0 net/ipv6/ip6_output.c:201 ip6_finish_output+0x31/0x240 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x1d1/0x3b0 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:453 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] mld_sendpack+0x676/0xb40 net/ipv6/mcast.c:1826 mld_send_cr net/ipv6/mcast.c:2127 [inline] mld_ifc_work+0x80c/0xbe0 net/ipv6/mcast.c:2659 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 18629: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3269 kmalloc include/linux/slab.h:616 [inline] dst_cow_metrics_generic+0x55/0x1c0 net/core/dst.c:206 dst_metrics_write_ptr include/net/dst.h:118 [inline] dst_metric_set include/net/dst.h:179 [inline] icmp6_dst_alloc+0x36a/0x560 net/ipv6/route.c:3293 ndisc_send_skb+0x258/0xc70 net/ipv6/ndisc.c:493 ndisc_send_rs+0x6e5/0x960 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x2c7/0x600 net/ipv6/addrconf.c:3979 call_timer_fn+0x38/0x290 kernel/time/timer.c:1457 expire_timers kernel/time/timer.c:1502 [inline] __run_timers+0x639/0x9a0 kernel/time/timer.c:1773 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1786 handle_softirqs+0x250/0x560 kernel/softirq.c:565 __do_softirq kernel/softirq.c:603 [inline] invoke_softirq kernel/softirq.c:425 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 Freed by task 13: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kfree+0xc4/0x270 mm/slub.c:4583 ip_dst_metrics_put include/net/ip.h:528 [inline] ip6_dst_destroy+0x9f/0x420 net/ipv6/route.c:360 dst_destroy+0xdd/0x2c0 net/core/dst.c:116 dst_destroy_rcu+0x19/0x20 net/core/dst.c:137 rcu_do_batch+0x51d/0xba0 kernel/rcu/tree.c:2523 rcu_core+0x5e4/0xf80 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x250/0x560 kernel/softirq.c:565 run_ksoftirqd+0x28/0x40 kernel/softirq.c:941 smpboot_thread_fn+0x45a/0x8c0 kernel/smpboot.c:164 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125 release_probes kernel/tracepoint.c:164 [inline] tracepoint_remove_func kernel/tracepoint.c:458 [inline] tracepoint_probe_unregister+0x829/0x890 kernel/tracepoint.c:551 bpf_probe_unregister+0x61/0x70 kernel/trace/bpf_trace.c:1952 bpf_raw_tp_link_release+0x63/0x90 kernel/bpf/syscall.c:2877 bpf_link_free+0x129/0x370 kernel/bpf/syscall.c:2443 bpf_link_put kernel/bpf/syscall.c:2469 [inline] bpf_link_release+0x15f/0x170 kernel/bpf/syscall.c:2477 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125 nf_hook_entries_free net/netfilter/core.c:94 [inline] __nf_unregister_net_hook+0x432/0x570 net/netfilter/core.c:490 nf_unregister_net_hook net/netfilter/core.c:-1 [inline] nf_unregister_net_hooks+0xe2/0x150 net/netfilter/core.c:577 ip6t_unregister_table_pre_exit+0x7c/0xb0 net/ipv6/netfilter/ip6_tables.c:1805 ip6table_filter_net_pre_exit+0x1c/0x20 net/ipv6/netfilter/ip6table_filter.c:71 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x4af/0xad0 net/core/net_namespace.c:587 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888124ff9880 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff888124ff9880, ffff888124ff98e0) The buggy address belongs to the page: page:ffffea000493fe40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x124ff9 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00043621c0 0000001000000010 ffff888100042900 raw: 0000000000000000 0000000000200020 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 1409, ts 92255252203, free_ts 92254103167 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5781 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:616 [inline] dst_cow_metrics_generic+0x55/0x1c0 net/core/dst.c:206 dst_metrics_write_ptr include/net/dst.h:118 [inline] dst_metric_set include/net/dst.h:179 [inline] icmp6_dst_alloc+0x36a/0x560 net/ipv6/route.c:3293 ndisc_send_skb+0x258/0xc70 net/ipv6/ndisc.c:493 ndisc_send_ns+0x842/0xaf0 net/ipv6/ndisc.c:655 addrconf_dad_work+0xa2b/0x1540 net/ipv6/addrconf.c:4221 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5857 __vunmap+0x84d/0x9e0 mm/vmalloc.c:2652 free_work+0x5a/0x80 mm/vmalloc.c:96 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888124ff9780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888124ff9800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888124ff9880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888124ff9900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888124ff9980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================