==================================================================
BUG: KASAN: slab-out-of-bounds in dsa_user_to_port net/dsa/user.h:58 [inline]
BUG: KASAN: slab-out-of-bounds in dsa_user_changeupper+0x61a/0x6e0 net/dsa/user.c:2809
Read of size 8 at addr ffff888042b7ac90 by task syz-executor.1/3931

CPU: 0 PID: 3931 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller-11091-g296455ade1fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:488
 kasan_report+0xda/0x110 mm/kasan/report.c:601
 dsa_user_to_port net/dsa/user.h:58 [inline]
 dsa_user_changeupper+0x61a/0x6e0 net/dsa/user.c:2809
 dsa_user_netdevice_event+0xd04/0x3480 net/dsa/user.c:3345
 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x130 net/core/dev.c:1966
 __netdev_upper_dev_link+0x439/0x850 net/core/dev.c:7759
 netdev_upper_dev_link+0x92/0xc0 net/core/dev.c:7800
 register_vlan_dev+0x396/0x940 net/8021q/vlan.c:183
 register_vlan_device net/8021q/vlan.c:277 [inline]
 vlan_ioctl_handler+0x8dd/0xa70 net/8021q/vlan.c:621
 sock_ioctl+0x4bd/0x6b0 net/socket.c:1305
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f8fb887cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8fb95150c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8fb89ac050 RCX: 00007f8fb887cda9
RDX: 0000000020000000 RSI: 0000000000008983 RDI: 0000000000000004
RBP: 00007f8fb88c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f8fb89ac050 R15: 00007f8fb8acfa48
 </TASK>

Allocated by task 15843:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3981 [inline]
 __kmalloc_node+0x21b/0x460 mm/slub.c:3988
 kmalloc_node include/linux/slab.h:610 [inline]
 kvmalloc_node+0x99/0x1a0 mm/util.c:617
 kvmalloc include/linux/slab.h:728 [inline]
 kvzalloc include/linux/slab.h:736 [inline]
 alloc_netdev_mqs+0xb3/0x12a0 net/core/dev.c:10826
 ipmr_reg_vif net/ipv4/ipmr.c:552 [inline]
 vif_add+0xe03/0x15e0 net/ipv4/ipmr.c:833
 ip_mroute_setsockopt+0x1197/0x1440 net/ipv4/ipmr.c:1438
 do_ip_setsockopt+0x2dc/0x37e0 net/ipv4/ip_sockglue.c:944
 ip_setsockopt+0x59/0xe0 net/ipv4/ip_sockglue.c:1411
 raw_setsockopt+0x218/0x290 net/ipv4/raw.c:834
 do_sock_setsockopt+0x222/0x470 net/socket.c:2311
 __sys_setsockopt+0x1a6/0x270 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xbd/0x150 net/socket.c:2340
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff888042b7a000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3216 bytes inside of
 allocated 3223-byte region [ffff888042b7a000, ffff888042b7ac97)

The buggy address belongs to the physical page:
page:ffffea00010ade00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42b78
head:ffffea00010ade00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888026089481
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff88801304f500 ffffea0000769400 dead000000000002
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888026089481
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 5100, tgid 5100 (syz-executor.0), ts 167990074420, free_ts 31942848056
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2190 [inline]
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2407
 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc_node_track_caller+0x35b/0x460 mm/slub.c:4001
 kmemdup+0x29/0x60 mm/util.c:131
 kmemdup include/linux/fortify-string.h:761 [inline]
 __addrconf_sysctl_register+0xc2/0x3f0 net/ipv6/addrconf.c:7129
 addrconf_sysctl_register net/ipv6/addrconf.c:7195 [inline]
 addrconf_sysctl_register+0x153/0x1e0 net/ipv6/addrconf.c:7184
 ipv6_add_dev+0x9f8/0x13d0 net/ipv6/addrconf.c:453
 addrconf_notify+0x542/0x18f0 net/ipv6/addrconf.c:3593
 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x130 net/core/dev.c:1966
 call_netdevice_notifiers_extack net/core/dev.c:2004 [inline]
 call_netdevice_notifiers net/core/dev.c:2018 [inline]
 register_netdevice+0x16e2/0x1da0 net/core/dev.c:10294
 veth_newlink+0x4f6/0xa10 drivers/net/veth.c:1946
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2346
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
 free_contig_range+0xb6/0x190 mm/page_alloc.c:6535
 destroy_args+0xa69/0xe40 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x16fe/0x3250 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x11c/0x650 init/main.c:1236
 do_initcall_level init/main.c:1298 [inline]
 do_initcalls init/main.c:1314 [inline]
 do_basic_setup init/main.c:1333 [inline]
 kernel_init_freeable+0x687/0xc10 init/main.c:1551
 kernel_init+0x1c/0x2a0 init/main.c:1441
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffff888042b7ab80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888042b7ac00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888042b7ac80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff888042b7ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888042b7ad80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================