================================================================== BUG: KASAN: slab-out-of-bounds in crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 Read of size 1 at addr ffff88801f1e4028 by task syz-executor.0/4481 CPU: 1 PID: 4481 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 udf_finalize_lvid fs/udf/super.c:2057 [inline] udf_sync_fs+0x194/0x350 fs/udf/super.c:2413 sync_filesystem+0xe6/0x220 fs/sync.c:56 generic_shutdown_super+0x6b/0x300 fs/super.c:448 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2f51a37c87 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd20c74dc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f2f51a91c5a RCX: 00007f2f51a37c87 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffd20c74e80 RBP: 00007ffd20c74e80 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd20c75f40 R13: 00007f2f51a91c5a R14: 0000000000013f68 R15: 0000000000000006 Allocated by task 4481: 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+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] fill_pool lib/debugobjects.c:172 [inline] __debug_object_init+0x7ab/0xa40 lib/debugobjects.c:615 debug_timer_init kernel/time/timer.c:724 [inline] debug_init kernel/time/timer.c:772 [inline] init_timer_key+0x3d/0x2a0 kernel/time/timer.c:816 mca_alloc net/ipv6/mcast.c:884 [inline] __ipv6_dev_mc_inc+0x4e3/0xa90 net/ipv6/mcast.c:935 ipv6_add_dev+0xcc9/0x1190 net/ipv6/addrconf.c:464 addrconf_notify+0x66f/0xf00 net/ipv6/addrconf.c:3576 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] register_netdevice+0x1275/0x16b0 net/core/dev.c:10428 veth_newlink+0x8ed/0xda0 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3526 [inline] rtnl_newlink+0x114c/0x17d0 net/core/rtnetlink.c:3574 rtnetlink_rcv_msg+0x7ff/0xe90 net/core/rtnetlink.c:5684 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x423/0x580 net/socket.c:2073 __do_sys_sendto net/socket.c:2085 [inline] __se_sys_sendto net/socket.c:2081 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88801f1e4000 which belongs to the cache debug_objects_cache of size 40 The buggy address is located 0 bytes to the right of 40-byte region [ffff88801f1e4000, ffff88801f1e4028) The buggy address belongs to the page: page:ffffea00007c7900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f1e4 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88801684f8c0 raw: 0000000000000000 0000000000490049 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 0x112020(__GFP_HIGH|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4481, ts 80268920500, free_ts 80267462464 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] fill_pool lib/debugobjects.c:172 [inline] __debug_object_init+0x7ab/0xa40 lib/debugobjects.c:615 debug_timer_init kernel/time/timer.c:724 [inline] debug_init kernel/time/timer.c:772 [inline] init_timer_key+0x3d/0x2a0 kernel/time/timer.c:816 mca_alloc net/ipv6/mcast.c:884 [inline] __ipv6_dev_mc_inc+0x4e3/0xa90 net/ipv6/mcast.c:935 ipv6_add_dev+0xcc9/0x1190 net/ipv6/addrconf.c:464 addrconf_notify+0x66f/0xf00 net/ipv6/addrconf.c:3576 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] register_netdevice+0x1275/0x16b0 net/core/dev.c:10428 veth_newlink+0x8ed/0xda0 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3526 [inline] rtnl_newlink+0x114c/0x17d0 net/core/rtnetlink.c:3574 rtnetlink_rcv_msg+0x7ff/0xe90 net/core/rtnetlink.c:5684 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 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+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc_track_caller+0x125/0x330 mm/slub.c:4930 kvasprintf+0xd4/0x180 lib/kasprintf.c:25 kobject_set_name_vargs+0x5d/0x110 lib/kobject.c:297 kobject_add_varg lib/kobject.c:392 [inline] kobject_init_and_add+0xda/0x190 lib/kobject.c:481 netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline] netdev_queue_update_kobjects+0x19c/0x3e0 net/core/net-sysfs.c:1711 register_queue_kobjects net/core/net-sysfs.c:1772 [inline] netdev_register_kobject+0x265/0x310 net/core/net-sysfs.c:2018 register_netdevice+0x1019/0x16b0 net/core/dev.c:10397 veth_newlink+0x8ed/0xda0 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3526 [inline] rtnl_newlink+0x114c/0x17d0 net/core/rtnetlink.c:3574 rtnetlink_rcv_msg+0x7ff/0xe90 net/core/rtnetlink.c:5684 Memory state around the buggy address: ffff88801f1e3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801f1e3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801f1e4000: 00 00 00 00 00 fc fc 00 00 00 00 00 fc fc 00 00 ^ ffff88801f1e4080: 00 00 00 fc fc 00 00 00 00 00 fc fc 00 00 00 00 ffff88801f1e4100: 00 fc fc 00 00 00 00 00 fc fc 00 00 00 00 00 fc ==================================================================