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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 ffff888065872c90 by task syz-executor.0/9661

CPU: 2 PID: 9661 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-11091-g296455ade1fd #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
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: 0033:0x7ff43087cda9
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:00007ff4316400c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff4309abf80 RCX: 00007ff43087cda9
RDX: 0000000020000080 RSI: 0000000000008982 RDI: 0000000000000003
RBP: 00007ff4308c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff4309abf80 R15: 00007ffeeb7d6798
 </TASK>

Allocated by task 5203:
 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
 rtnl_create_link+0xc82/0xfb0 net/core/rtnetlink.c:3379
 rtnl_newlink_create net/core/rtnetlink.c:3505 [inline]
 __rtnl_newlink+0x10a1/0x1940 net/core/rtnetlink.c:3735
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3748
 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x225/0x310 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2199
 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 ffff888065872000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3216 bytes inside of
 allocated 3223-byte region [ffff888065872000, ffff888065872c97)

The buggy address belongs to the physical page:
page:ffffea0001961c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x65870
head:ffffea0001961c00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888013050280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
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 5202, tgid 5202 (syz-executor.1), ts 155760281785, free_ts 0
 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
 br_dev_newlink+0x27/0x110 net/bridge/br_netlink.c:1562
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888065872b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888065872c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888065872c80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff888065872d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888065872d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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