EXT4-fs (loop3): mounted filesystem without journal. Quota mode: none.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x7c0/0x15ac fs/ext4/xattr.c:1742
Read of size 18446744073709551588 at addr ffff0000dd6c7040 by task syz.3.507/7313

CPU: 1 PID: 7313 Comm: syz.3.507 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0x100 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x7c0/0x15ac fs/ext4/xattr.c:1742
 ext4_xattr_block_set+0x614/0x2810 fs/ext4/xattr.c:1989
 ext4_xattr_set_handle+0xe30/0x102c fs/ext4/xattr.c:2414
 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2516
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x228/0x28c fs/xattr.c:617
 path_setxattr+0x12c/0x25c fs/xattr.c:636
 __do_sys_lsetxattr fs/xattr.c:659 [inline]
 __se_sys_lsetxattr fs/xattr.c:655 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 7313:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956
 kmemdup+0x5c/0x98 mm/util.c:129
 kmemdup include/linux/fortify-string.h:585 [inline]
 ext4_xattr_block_set+0x558/0x2810 fs/ext4/xattr.c:1937
 ext4_xattr_set_handle+0xe30/0x102c fs/ext4/xattr.c:2414
 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2516
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x228/0x28c fs/xattr.c:617
 path_setxattr+0x12c/0x25c fs/xattr.c:636
 __do_sys_lsetxattr fs/xattr.c:659 [inline]
 __se_sys_lsetxattr fs/xattr.c:655 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849
 sctp_transport_destroy net/sctp/transport.c:173 [inline]
 sctp_transport_put+0xf0/0x174 net/sctp/transport.c:486
 sctp_transport_free+0x140/0x158 net/sctp/transport.c:144
 sctp_association_free+0x5c0/0x6e0 net/sctp/associola.c:382
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1331 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
 sctp_do_sm+0x2ce0/0x4894 net/sctp/sm_sideeffect.c:1170
 sctp_endpoint_bh_rcv+0x498/0x69c net/sctp/endpointola.c:402
 sctp_inq_push+0x190/0x1b4 net/sctp/inqueue.c:88
 sctp_rcv+0x1ad0/0x21cc net/sctp/input.c:258
 sctp6_rcv+0x4c/0x80 net/sctp/ipv6.c:1111
 ip6_protocol_deliver_rcu+0x928/0x11d0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x164/0x298 net/ipv6/ip6_input.c:483
 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302
 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:492
 dst_input include/net/dst.h:463 [inline]
 ip6_rcv_finish+0x1f4/0x220 net/ipv6/ip6_input.c:79
 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core net/core/dev.c:5581 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5695
 process_backlog+0x408/0x714 net/core/dev.c:6023
 __napi_poll+0xb4/0x3f0 net/core/dev.c:6590
 napi_poll net/core/dev.c:6657 [inline]
 net_rx_action+0x50c/0xb10 net/core/dev.c:6771
 handle_softirqs+0x318/0xc6c kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630

Second to last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849
 __qdisc_destroy+0x2a8/0x500 net/sched/sch_generic.c:1084
 qdisc_put net/sched/sch_generic.c:1104 [inline]
 dev_shutdown+0x35c/0x47c net/sched/sch_generic.c:1492
 unregister_netdevice_many+0x944/0x1740 net/core/dev.c:10981
 default_device_exit_batch+0x9a8/0xa40 net/core/dev.c:11503
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x644/0xa74 net/core/net_namespace.c:640
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

The buggy address belongs to the object at ffff0000dd6c7000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff0000dd6c7000, ffff0000dd6c7400)

The buggy address belongs to the physical page:
page:00000000e7ba25aa refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d6c0
head:00000000e7ba25aa order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c0002780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dd6c6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000dd6c6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000dd6c7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff0000dd6c7080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dd6c7100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
netlink: 'syz.3.507': attribute type 4 has an invalid length.