================================================================== BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x4c0/0x668 fs/udf/inode.c:2088 Write of size 4 at addr ffff0000d19137f0 by task syz-executor.3/14537 CPU: 1 PID: 14537 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:417 kasan_report+0xd4/0x130 mm/kasan/report.c:517 __asan_report_store_n_noabort+0x28/0x34 mm/kasan/report_generic.c:367 udf_write_aext+0x4c0/0x668 fs/udf/inode.c:2088 udf_add_entry+0x11e0/0x28b0 fs/udf/namei.c:482 udf_mkdir+0x158/0x7e0 fs/udf/namei.c:681 vfs_mkdir+0x334/0x4e4 fs/namei.c:4036 do_mkdirat+0x200/0x5f8 fs/namei.c:4061 __do_sys_mkdirat fs/namei.c:4076 [inline] __se_sys_mkdirat fs/namei.c:4074 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 9: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:512 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1067 kmalloc include/linux/slab.h:580 [inline] batadv_forw_packet_alloc+0x1a8/0x3c4 net/batman-adv/send.c:519 batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:563 [inline] batadv_iv_ogm_queue_add+0x624/0xab0 net/batman-adv/bat_iv_ogm.c:671 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:850 [inline] batadv_iv_ogm_schedule+0x9d8/0xda0 net/batman-adv/bat_iv_ogm.c:869 batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x900 net/batman-adv/bat_iv_ogm.c:1713 process_one_work+0x848/0x16b4 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:493 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:503 insert_work+0x64/0x384 kernel/workqueue.c:1358 __queue_work+0xdc4/0x1484 kernel/workqueue.c:1517 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:1643 call_timer_fn+0x250/0xc94 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1746 [inline] __run_timers+0x5b4/0x734 kernel/time/timer.c:2022 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2035 __do_softirq+0x368/0xfa4 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:493 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:503 __call_rcu_common kernel/rcu/tree.c:2755 [inline] call_rcu+0x104/0xb38 kernel/rcu/tree.c:2868 fib6_info_release include/net/ip6_fib.h:340 [inline] fixup_permanent_addr net/ipv6/addrconf.c:3496 [inline] addrconf_permanent_addr+0x2e8/0xa6c net/ipv6/addrconf.c:3524 addrconf_notify+0x784/0xc74 net/ipv6/addrconf.c:3596 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 __dev_notify_flags+0x2bc/0x544 dev_change_flags+0xd0/0x15c net/core/dev.c:8599 do_setlink+0xc70/0x3334 net/core/rtnetlink.c:2827 __rtnl_newlink net/core/rtnetlink.c:3590 [inline] rtnl_newlink+0x1354/0x1b1c net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x6ec/0xc8c net/core/rtnetlink.c:6141 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2574 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6159 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x800/0xae0 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x3b4/0x504 net/socket.c:2120 __do_sys_sendto net/socket.c:2132 [inline] __se_sys_sendto net/socket.c:2128 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2128 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000d1913400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 496 bytes to the right of 512-byte region [ffff0000d1913400, ffff0000d1913600) The buggy address belongs to the physical page: page:000000001ae750ee refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111910 head:000000001ae750ee order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0002600 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d1913680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d1913700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d1913780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d1913800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d1913880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================