netlink: 'syz-executor.0': attribute type 10 has an invalid length. ================================================================== 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 ffff8880407c8c90 by task syz-executor.0/6146 CPU: 1 PID: 6146 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-04667-g9d1a26e7e43c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __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_master_upper_dev_link+0xa0/0xd0 net/core/dev.c:7829 batadv_hardif_enable_interface+0x28a/0xd20 net/batman-adv/hard-interface.c:734 batadv_softif_slave_add+0xee/0x130 net/batman-adv/soft-interface.c:844 do_set_master+0x1b5/0x220 net/core/rtnetlink.c:2704 do_setlink+0xa4a/0x4090 net/core/rtnetlink.c:2903 __rtnl_newlink+0xc28/0x1940 net/core/rtnetlink.c:3701 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_sendmsg+0x6ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 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: 0033:0x7f4af467cda9 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:00007f4af53d40c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4af47ac050 RCX: 00007f4af467cda9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 000000000000000a RBP: 00007f4af46c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f4af47ac050 R15: 00007ffd05cead58 Allocated by task 18603: 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 ffff8880407c8000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3216 bytes inside of allocated 3223-byte region [ffff8880407c8000, ffff8880407c8c97) The buggy address belongs to the physical page: page:ffffea000101f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x407c8 head:ffffea000101f200 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 ffff88801304f500 ffffea0000b4e400 dead000000000002 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 5090, tgid 5090 (syz-executor.0), ts 214295668428, free_ts 30827350270 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] kmalloc_trace+0x30b/0x340 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:356 [inline] ipv6_add_dev+0x586/0x13d0 net/ipv6/addrconf.c:406 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 tun_set_iff drivers/net/tun.c:2850 [inline] __tun_chr_ioctl+0x25b6/0x4790 drivers/net/tun.c:3119 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 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: ffff8880407c8b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880407c8c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880407c8c80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880407c8d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880407c8d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================