================================================================== BUG: KASAN: use-after-free in ifname_compare_aligned include/linux/netfilter/x_tables.h:412 [inline] BUG: KASAN: use-after-free in ip_packet_match net/ipv4/netfilter/ip_tables.c:64 [inline] BUG: KASAN: use-after-free in ipt_do_table+0x762/0x17e0 net/ipv4/netfilter/ip_tables.c:285 Read of size 8 at addr ffff88802b07a000 by task syz-executor.5/13697 CPU: 0 PID: 13697 Comm: syz-executor.5 Not tainted 6.0.0-rc2-syzkaller-00283-g10d4879f9ef0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 ifname_compare_aligned include/linux/netfilter/x_tables.h:412 [inline] ip_packet_match net/ipv4/netfilter/ip_tables.c:64 [inline] ipt_do_table+0x762/0x17e0 net/ipv4/netfilter/ip_tables.c:285 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:620 nf_hook+0x26e/0x3d0 include/linux/netfilter.h:262 NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_mc_output+0x449/0x5b0 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:451 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb+0x113/0x1a0 net/ipv4/ip_output.c:1589 udp_send_skb+0xa69/0x13f0 net/ipv4/udp.c:969 udp_sendmsg+0x1d30/0x2b00 net/ipv4/udp.c:1256 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmmsg+0x3d7/0x770 net/socket.c:2622 __do_sys_sendmmsg net/socket.c:2651 [inline] __se_sys_sendmmsg net/socket.c:2648 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2648 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe072089279 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe0732ac168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fe07219c050 RCX: 00007fe072089279 RDX: 0400000000000695 RSI: 0000000020007fc0 RDI: 0000000000000003 RBP: 00007fe0720e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3ee8a3bf R14: 00007fe0732ac300 R15: 0000000000022000 Allocated by task 3636: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc_node+0x26f/0x420 mm/slub.c:4472 kmalloc_node include/linux/slab.h:623 [inline] kvmalloc_node+0x6e/0x160 mm/util.c:613 kvmalloc include/linux/slab.h:750 [inline] kvzalloc include/linux/slab.h:758 [inline] alloc_netdev_mqs+0x85/0xea0 net/core/dev.c:10603 rtnl_create_link+0x2db/0x9e0 net/core/rtnetlink.c:3241 rtnl_newlink_create net/core/rtnetlink.c:3353 [inline] __rtnl_newlink net/core/rtnetlink.c:3580 [inline] rtnl_newlink+0x13ec/0x2060 net/core/rtnetlink.c:3593 rtnetlink_rcv_msg+0x7c9/0xeb0 net/core/rtnetlink.c:6090 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x46d/0x5f0 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 13692: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xda/0x210 mm/slub.c:4562 device_release+0x98/0x1c0 kobject_cleanup+0x235/0x470 lib/kobject.c:673 netdev_run_todo+0xf9c/0x1090 net/core/dev.c:10385 vlan_ioctl_handler+0x49c/0x970 net/8021q/vlan.c:654 sock_ioctl+0x540/0x770 net/socket.c:1250 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88802b07a000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff88802b07a000, ffff88802b07b000) The buggy address belongs to the physical page: page:ffffea0000ac1e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b078 head:ffffea0000ac1e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801204c280 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 3640, tgid 3640 (syz-executor.4), ts 132448325393, free_ts 131829071750 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 alloc_slab_page+0x70/0xf0 mm/slub.c:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmalloc_track_caller+0x2ac/0x350 mm/slub.c:4924 kmemdup+0x21/0x50 mm/util.c:129 __addrconf_sysctl_register+0xad/0x3c0 net/ipv6/addrconf.c:7061 addrconf_sysctl_register+0x128/0x180 net/ipv6/addrconf.c:7126 ipv6_add_dev+0xc44/0x1200 net/ipv6/addrconf.c:450 addrconf_notify+0x629/0xf80 net/ipv6/addrconf.c:3528 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1945 [inline] call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:1997 register_netdevice+0x15d5/0x1a20 net/core/dev.c:10103 ipvlan_link_new+0x3e6/0xa70 drivers/net/ipvlan/ipvlan_main.c:584 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] __rtnl_newlink net/core/rtnetlink.c:3580 [inline] rtnl_newlink+0x14ed/0x2060 net/core/rtnetlink.c:3593 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 __vunmap+0x867/0x9d0 mm/vmalloc.c:2696 kcov_put kernel/kcov.c:421 [inline] kcov_close+0x27/0x50 kernel/kcov.c:517 __fput+0x3b9/0x820 fs/file_table.c:320 task_work_run+0x146/0x1c0 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x55e/0x20a0 kernel/exit.c:795 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88802b079f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b079f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802b07a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b07a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b07a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================