================================================================== BUG: KASAN: slab-out-of-bounds in ntfs_filldir fs/ntfs/dir.c:1021 [inline] BUG: KASAN: slab-out-of-bounds in ntfs_readdir+0xe21/0x3660 fs/ntfs/dir.c:1200 Read of size 1 at addr ffff888061f10999 by task syz-executor/4188 CPU: 0 PID: 4188 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 ntfs_filldir fs/ntfs/dir.c:1021 [inline] ntfs_readdir+0xe21/0x3660 fs/ntfs/dir.c:1200 iterate_dir+0x213/0x550 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6b780157f3 Code: c7 c0 e8 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb 9e e8 81 9b fd ff 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7 d8 RSP: 002b:00007ffdc98080d8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555571121a80 RCX: 00007f6b780157f3 RDX: 0000000000008000 RSI: 0000555571121ab0 RDI: 0000000000000006 RBP: 0000555571121ab0 R08: 00007f6b7823de20 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000293 R12: 0000555571121a84 R13: ffffffffffffffe8 R14: 0000000000000016 R15: 00007ffdc980b470 Allocated by task 4188: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:612 [inline] ntfs_readdir+0x77a/0x3660 fs/ntfs/dir.c:1162 iterate_dir+0x213/0x550 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888061f10800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 409 bytes inside of 512-byte region [ffff888061f10800, ffff888061f10a00) The buggy address belongs to the page: page:ffffea000187c400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x61f10 head:ffffea000187c400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016c41c80 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4189, ts 59901186081, free_ts 59901133710 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x3fb/0xac0 net/ipv6/mcast.c:935 ipv6_add_dev+0xce2/0x11a0 net/ipv6/addrconf.c:467 addrconf_notify+0x66f/0xf20 net/ipv6/addrconf.c:3579 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] register_netdevice+0x12a8/0x1720 net/core/dev.c:10454 veth_newlink+0x8ca/0xe20 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3530 [inline] rtnl_newlink+0x139e/0x1920 net/core/rtnetlink.c:3578 rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 stack_depot_save+0x42f/0x460 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track+0x62/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 netlink_broadcast_filtered+0x107f/0x1170 net/netlink/af_netlink.c:1539 netlink_broadcast net/netlink/af_netlink.c:1561 [inline] nlmsg_multicast include/net/netlink.h:1044 [inline] nlmsg_notify+0xdf/0x190 net/netlink/af_netlink.c:2555 __addrconf_sysctl_register+0x375/0x3e0 net/ipv6/addrconf.c:7116 addrconf_sysctl_register+0x15c/0x1b0 net/ipv6/addrconf.c:7153 ipv6_add_dev+0xbfb/0x11a0 net/ipv6/addrconf.c:454 addrconf_notify+0x66f/0xf20 net/ipv6/addrconf.c:3579 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] register_netdevice+0x12a8/0x1720 net/core/dev.c:10454 Memory state around the buggy address: ffff888061f10880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888061f10900: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc >ffff888061f10980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888061f10a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888061f10a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================