loop2: detected capacity change from 0 to 2048 ================================================================== BUG: KASAN: use-after-free in nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 Read of size 8 at addr ffff888077124298 by task syz-executor.2/26708 CPU: 0 PID: 26708 Comm: syz-executor.2 Not tainted 6.0.0-syzkaller-05118-g833477fce7a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 nilfs_free_inode+0x44/0x70 fs/nilfs2/super.c:168 i_callback fs/inode.c:249 [inline] alloc_inode fs/inode.c:274 [inline] iget5_locked+0x23d/0x270 fs/inode.c:1242 nilfs_iget_locked fs/nilfs2/inode.c:588 [inline] nilfs_iget+0x162/0x8b0 fs/nilfs2/inode.c:597 nilfs_lookup+0xca/0x110 fs/nilfs2/namei.c:63 __lookup_hash+0x115/0x240 fs/namei.c:1601 do_renameat2+0x4cb/0x1370 fs/namei.c:4850 __do_sys_renameat2 fs/namei.c:4940 [inline] __se_sys_renameat2 fs/namei.c:4937 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4937 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f48f748a5a9 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:00007f48f8624168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f48f75abf80 RCX: 00007f48f748a5a9 RDX: 0000000000000004 RSI: 0000000020000880 RDI: 0000000000000003 RBP: 00007f48f86241d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000b80 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc709503af R14: 00007f48f8624300 R15: 0000000000022000 Allocated by task 26550: 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+0xcd/0x100 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4429 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] nilfs_mdt_init+0x42/0x1c0 fs/nilfs2/mdt.c:451 nilfs_cpfile_read+0x121/0x1a0 fs/nilfs2/cpfile.c:997 nilfs_load_super_root fs/nilfs2/the_nilfs.c:125 [inline] load_nilfs+0x57e/0xfc0 fs/nilfs2/the_nilfs.c:269 nilfs_fill_super+0x27e/0x5d0 fs/nilfs2/super.c:1059 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 kvfree_call_rcu+0x112/0x880 kernel/rcu/tree.c:3341 drop_sysctl_table+0x307/0x480 fs/proc/proc_sysctl.c:1716 drop_sysctl_table+0x319/0x480 fs/proc/proc_sysctl.c:1719 unregister_sysctl_table+0x87/0x140 fs/proc/proc_sysctl.c:1754 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7112 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7140 [inline] addrconf_ifdown+0x17d5/0x1b30 net/ipv6/addrconf.c:3903 addrconf_notify+0x3be/0xfe0 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 net/core/dev.c:1997 [inline] unregister_netdevice_many+0x107e/0x1aa0 net/core/dev.c:10843 default_device_exit_batch+0x570/0x5e0 net/core/dev.c:11337 ops_exit_list net/core/net_namespace.c:167 [inline] cleanup_net+0x80c/0xc50 net/core/net_namespace.c:594 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Second to last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x970 kernel/rcu/tree.c:2796 fib_create_info+0x18d0/0x2410 net/ipv4/fib_semantics.c:1580 fib_table_insert+0x1e5/0x1f50 net/ipv4/fib_trie.c:1236 fib_magic+0x451/0x650 net/ipv4/fib_frontend.c:1098 fib_add_ifaddr+0x143/0x5c0 net/ipv4/fib_frontend.c:1120 fib_netdev_event+0x628/0x740 net/ipv4/fib_frontend.c:1480 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 __dev_notify_flags+0x2ef/0x5d0 dev_change_flags+0xe3/0x190 net/core/dev.c:8615 do_setlink+0xef5/0x3d40 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x1748/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 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+0x46e/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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888077124200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of 256-byte region [ffff888077124200, ffff888077124300) The buggy address belongs to the physical page: page:ffffea0001dc4900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077124200 pfn:0x77124 head:ffffea0001dc4900 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000861f88 ffffea0001ddb608 ffff888012041b40 raw: ffff888077124200 000000000010000e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3633, tgid 3633 (syz-executor.0), ts 106279602581, free_ts 105451010831 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x3ee/0xc40 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] kmem_cache_alloc_trace+0x25f/0x310 mm/slub.c:3287 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ____ip_mc_inc_group+0x2e9/0xae0 net/ipv4/igmp.c:1449 __ip_mc_inc_group net/ipv4/igmp.c:1484 [inline] ip_mc_inc_group net/ipv4/igmp.c:1490 [inline] ip_mc_up+0x119/0x2d0 net/ipv4/igmp.c:1789 inetdev_event+0xf0e/0x14a0 net/ipv4/devinet.c:1577 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 __dev_notify_flags+0x2ef/0x5d0 dev_change_flags+0xe3/0x190 net/core/dev.c:8615 do_setlink+0xef5/0x3d40 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x1748/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 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/0x5f0 mm/page_alloc.c:3476 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 ____kasan_kmalloc+0x2f/0x100 mm/kasan/common.c:482 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4429 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:156 ip6_route_info_create+0x43d/0x12e0 net/ipv6/route.c:3749 ip6_route_add+0x22/0x120 net/ipv6/route.c:3843 addrconf_add_mroute+0x31b/0x450 net/ipv6/addrconf.c:2489 addrconf_add_dev+0x113/0x1a0 net/ipv6/addrconf.c:2507 addrconf_dev_config+0x11b/0x3a0 net/ipv6/addrconf.c:3382 addrconf_notify+0xb48/0xfe0 net/ipv6/addrconf.c:3635 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] netdev_state_change+0x19b/0x260 net/core/dev.c:1334 linkwatch_do_dev+0x10a/0x160 net/core/link_watch.c:168 Memory state around the buggy address: ffff888077124180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077124200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077124280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077124300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077124380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================