================================================================== BUG: KASAN: slab-use-after-free in xsk_bind+0x1582/0x16c0 net/xdp/xsk.c:1761 Read of size 4 at addr ffff88802622798c by task syz.0.1017/9576 CPU: 0 UID: 0 PID: 9576 Comm: syz.0.1017 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 xsk_bind+0x1582/0x16c0 net/xdp/xsk.c:1761 __sys_bind_socket net/socket.c:1945 [inline] __sys_bind_socket net/socket.c:1937 [inline] __sys_bind+0x1a9/0x260 net/socket.c:1976 __do_sys_bind net/socket.c:1981 [inline] __se_sys_bind net/socket.c:1979 [inline] __x64_sys_bind+0x72/0xb0 net/socket.c:1979 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4d0719e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4d07fb4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f4d07426090 RCX: 00007f4d0719e0d9 RDX: 0000000000000010 RSI: 00002000000003c0 RDI: 0000000000000004 RBP: 00007f4d07235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4d07426128 R14: 00007f4d07426090 R15: 00007ffc0b17c0f8 Allocated by task 5601: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5337 [inline] __kvmalloc_node_noprof+0x351/0x970 mm/slub.c:6900 xt_alloc_table_info+0x44/0xa0 net/netfilter/x_tables.c:1286 do_replace net/ipv4/netfilter/ip_tables.c:1124 [inline] do_ipt_set_ctl+0x611/0xcf0 net/ipv4/netfilter/ip_tables.c:1634 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4179 do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2397 __sys_setsockopt+0x195/0x220 net/socket.c:2422 __do_sys_setsockopt net/socket.c:2428 [inline] __se_sys_setsockopt net/socket.c:2425 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2425 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5601: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2678 [inline] slab_free mm/slub.c:6372 [inline] kfree+0x22b/0x6c0 mm/slub.c:6687 __do_replace+0x71f/0x980 net/ipv4/netfilter/ip_tables.c:1082 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline] do_ipt_set_ctl+0xa53/0xcf0 net/ipv4/netfilter/ip_tables.c:1634 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4179 do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2397 __sys_setsockopt+0x195/0x220 net/socket.c:2422 __do_sys_setsockopt net/socket.c:2428 [inline] __se_sys_setsockopt net/socket.c:2425 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2425 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888026227800 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 396 bytes inside of freed 1024-byte region [ffff888026227800, ffff888026227c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888026220800 pfn:0x26220 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802cc36901 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801c031280 ffffea0000aaa610 ffffea0001ee4410 raw: ffff888026220800 000000080010000c 00000000f5000000 ffff88802cc36901 head: 00fff00000000240 ffff88801c031280 ffffea0000aaa610 ffffea0001ee4410 head: ffff888026220800 000000080010000c 00000000f5000000 ffff88802cc36901 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5599, tgid 5599 (syz-executor), ts 72797392003 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3267 [inline] allocate_slab mm/slub.c:3382 [inline] new_slab+0xa5/0x640 mm/slub.c:3428 refill_objects+0xe3/0x410 mm/slub.c:7305 refill_sheaf mm/slub.c:2805 [inline] __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4677 alloc_from_pcs mm/slub.c:4775 [inline] slab_alloc_node mm/slub.c:4907 [inline] __do_kmalloc_node mm/slub.c:5336 [inline] __kmalloc_noprof+0x66b/0x820 mm/slub.c:5362 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] __register_sysctl_table+0xac/0x1650 fs/proc/proc_sysctl.c:1378 register_net_sysctl_sz+0x325/0x420 net/sysctl_net.c:172 neigh_sysctl_register+0x326/0x660 net/core/neighbour.c:3915 addrconf_sysctl_register+0xb9/0x200 net/ipv6/addrconf.c:7396 ipv6_add_dev+0xaf2/0x1520 net/ipv6/addrconf.c:460 addrconf_notify+0x5db/0x1ba0 net/ipv6/addrconf.c:3686 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline] call_netdevice_notifiers net/core/dev.c:2327 [inline] register_netdevice+0x1998/0x25a0 net/core/dev.c:11541 page last free pid 5258 tgid 5258 ts 46385218939 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4586 [inline] slab_alloc_node mm/slub.c:4919 [inline] kmem_cache_alloc_node_noprof+0x27f/0x6b0 mm/slub.c:4991 __alloc_skb+0x140/0x710 net/core/skbuff.c:704 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xdd/0x760 net/core/skbuff.c:6775 sock_alloc_send_pskb+0x801/0x980 net/core/sock.c:3012 unix_dgram_sendmsg+0x3c7/0x1810 net/unix/af_unix.c:2144 unix_seqpacket_sendmsg+0x12a/0x1d0 net/unix/af_unix.c:2545 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] sock_write_iter+0x53a/0x5b0 net/socket.c:1266 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x1f8/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888026227880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026227900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888026227980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026227a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026227a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================