hpfs: hpfs_map_sector(): read error hpfs: code page support is disabled ================================================================== BUG: KASAN: slab-use-after-free in strcmp+0x6b/0xb0 lib/string.c:288 Read of size 1 at addr ffff8880673a78a6 by task syz.8.409/8967 CPU: 0 PID: 8967 Comm: syz.8.409 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 strcmp+0x6b/0xb0 lib/string.c:288 hpfs_get_ea+0x135/0xed0 fs/hpfs/ea.c:139 hpfs_read_inode+0x1a7/0x1050 fs/hpfs/inode.c:63 hpfs_fill_super+0x135e/0x1fe0 fs/hpfs/super.c:712 mount_bdev+0x221/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6cf3b9e0ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6cf4b0ee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6cf4b0eee0 RCX: 00007f6cf3b9e0ca RDX: 0000200000000000 RSI: 0000200000009ec0 RDI: 00007f6cf4b0eea0 RBP: 0000200000000000 R08: 00007f6cf4b0eee0 R09: 0000000003200041 R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000009ec0 R13: 00007f6cf4b0eea0 R14: 0000000000009e2f R15: 0000200000000240 Allocated by task 7691: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x230 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] new_dir fs/proc/proc_sysctl.c:969 [inline] get_subdir fs/proc/proc_sysctl.c:1013 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1308 [inline] __register_sysctl_table+0xac9/0x1240 fs/proc/proc_sysctl.c:1389 __devinet_sysctl_register+0x375/0x470 net/ipv4/devinet.c:2633 devinet_sysctl_register+0x17c/0x1f0 net/ipv4/devinet.c:2673 inetdev_init+0x2b4/0x4f0 net/ipv4/devinet.c:287 inetdev_event+0x324/0x1630 net/ipv4/devinet.c:1568 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline] call_netdevice_notifiers net/core/dev.c:2091 [inline] register_netdevice+0x16a5/0x1bb0 net/core/dev.c:10351 __ip_tunnel_create+0x3bc/0x4d0 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2df/0x790 net/ipv4/ip_tunnel.c:1104 ops_init+0x397/0x640 net/core/net_namespace.c:139 setup_net+0x3b6/0xa30 net/core/net_namespace.c:343 copy_net_ns+0x36d/0x5e0 net/core/net_namespace.c:520 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228 ksys_unshare+0x4f5/0x8c0 kernel/fork.c:3442 __do_sys_unshare kernel/fork.c:3516 [inline] __se_sys_unshare kernel/fork.c:3514 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3514 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xee/0x790 kernel/rcu/tree.c:3452 drop_sysctl_table+0x394/0x540 fs/proc/proc_sysctl.c:1515 drop_sysctl_table+0x3ab/0x540 fs/proc/proc_sysctl.c:1518 unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1536 __devinet_sysctl_unregister net/ipv4/devinet.c:2656 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2684 [inline] inetdev_destroy net/ipv4/devinet.c:330 [inline] inetdev_event+0x79a/0x1630 net/ipv4/devinet.c:1636 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline] call_netdevice_notifiers net/core/dev.c:2091 [inline] unregister_netdevice_many_notify+0x100d/0x1900 net/core/dev.c:11124 ip_tunnel_delete_nets+0x324/0x370 net/ipv4/ip_tunnel.c:1157 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x795/0xbb0 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2721 [inline] call_rcu+0x153/0x950 kernel/rcu/tree.c:2837 fib_create_info+0x1845/0x2460 net/ipv4/fib_semantics.c:1590 fib_table_insert+0xc6/0x1b20 net/ipv4/fib_trie.c:1217 fib_magic+0x2e5/0x3c0 net/ipv4/fib_frontend.c:1118 fib_add_ifaddr+0x144/0x5e0 net/ipv4/fib_frontend.c:1140 fib_netdev_event+0x389/0x490 net/ipv4/fib_frontend.c:1500 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline] call_netdevice_notifiers net/core/dev.c:2091 [inline] __dev_notify_flags+0x1aa/0x310 net/core/dev.c:8762 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8800 do_setlink+0xc58/0x4130 net/core/rtnetlink.c:2909 __rtnl_newlink net/core/rtnetlink.c:3707 [inline] rtnl_newlink+0x17da/0x20a0 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6476 netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x4a9/0x6b0 net/socket.c:2200 __do_sys_sendto net/socket.c:2212 [inline] __se_sys_sendto net/socket.c:2208 [inline] __x64_sys_sendto+0xde/0xf0 net/socket.c:2208 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880673a7800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 166 bytes inside of freed 256-byte region [ffff8880673a7800, ffff8880673a7900) The buggy address belongs to the physical page: page:ffffea00019ce980 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880673a6c00 pfn:0x673a6 head:ffffea00019ce980 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017c41b40 ffffea0000bf8490 ffffea00009a6610 raw: ffff8880673a6c00 0000000000100004 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7080, tgid 7080 (syz-executor), ts 262409638077, free_ts 262392809513 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581 prep_new_page mm/page_alloc.c:1588 [inline] get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500 alloc_slab_page+0x5d/0x160 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa4/0x230 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] new_dir fs/proc/proc_sysctl.c:969 [inline] get_subdir fs/proc/proc_sysctl.c:1013 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1308 [inline] __register_sysctl_table+0xac9/0x1240 fs/proc/proc_sysctl.c:1389 mpls_dev_sysctl_register+0x207/0x2f0 net/mpls/af_mpls.c:1406 mpls_add_dev net/mpls/af_mpls.c:1462 [inline] mpls_dev_notify+0x357/0x7a0 net/mpls/af_mpls.c:1602 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline] call_netdevice_notifiers net/core/dev.c:2091 [inline] register_netdevice+0x16a5/0x1bb0 net/core/dev.c:10351 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:343 [inline] nsim_create+0x3ca/0x4a0 drivers/net/netdevsim/netdev.c:401 __nsim_dev_port_add+0x708/0xb20 drivers/net/netdevsim/dev.c:1393 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1449 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1181 [inline] free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458 __slab_free+0x35a/0x400 mm/slub.c:3736 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1184 [inline] netlink_sendmsg+0x66a/0xbf0 net/netlink/af_netlink.c:1869 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x4a9/0x6b0 net/socket.c:2200 __do_sys_sendto net/socket.c:2212 [inline] __se_sys_sendto net/socket.c:2208 [inline] __x64_sys_sendto+0xde/0xf0 net/socket.c:2208 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8880673a7780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880673a7800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880673a7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880673a7900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880673a7980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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