================================================================== BUG: KASAN: slab-out-of-bounds in link_path_walk+0x9e9/0xeb0 fs/namei.c:2403 Read of size 1 at addr ffff88811e0b11aa by task syz.2.396/1653 CPU: 0 UID: 0 PID: 1653 Comm: syz.2.396 Not tainted syzkaller #0 0dce1a42a4db61fd93e445decfbc7fc3d71b95b8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 print_address_description+0x71/0x210 mm/kasan/report.c:377 print_report+0x4a/0x70 mm/kasan/report.c:481 kasan_report+0x162/0x1a0 mm/kasan/report.c:594 __asan_report_load1_noabort+0x18/0x20 mm/kasan/report_generic.c:378 link_path_walk+0x9e9/0xeb0 fs/namei.c:2403 path_parentat fs/namei.c:2635 [inline] __filename_parentat+0x231/0x660 fs/namei.c:2659 filename_parentat fs/namei.c:2677 [inline] do_rmdir+0xe0/0x590 fs/namei.c:4375 __do_sys_unlinkat fs/namei.c:4583 [inline] __se_sys_unlinkat fs/namei.c:4577 [inline] __x64_sys_unlinkat+0xc9/0xf0 fs/namei.c:4577 x64_sys_call+0x2974/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fb51db9e559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb51c51d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007fb51de26540 RCX: 00007fb51db9e559 RDX: 0000000000000200 RSI: 0000200000000180 RDI: 0000000000000007 RBP: 00007fb51dc358b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb51de265d8 R14: 00007fb51de26540 R15: 00007ffd07952c78 Allocated by task 1652: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396 kasan_kmalloc include/linux/kasan.h:261 [inline] __do_kmalloc_node mm/slub.c:4395 [inline] __kmalloc_node_track_caller_noprof+0x24e/0x4f0 mm/slub.c:4414 kstrdup+0x4d/0x130 mm/util.c:70 bpf_symlink+0x2d/0x200 kernel/bpf/inode.c:386 vfs_symlink+0x3f7/0x620 fs/namei.c:4623 do_symlinkat+0x1ba/0x400 fs/namei.c:4649 __do_sys_symlinkat fs/namei.c:4665 [inline] __se_sys_symlinkat fs/namei.c:4662 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4662 x64_sys_call+0x1f79/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:267 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 1647: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_free_info+0x44/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:249 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:266 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2445 [inline] slab_free mm/slub.c:4714 [inline] kfree+0x158/0x440 mm/slub.c:4875 bpf_destroy_inode+0x7e/0x180 kernel/bpf/inode.c:783 destroy_inode fs/inode.c:319 [inline] evict+0x81d/0xaf0 fs/inode.c:762 iput_final fs/inode.c:1890 [inline] iput+0x651/0x910 fs/inode.c:1916 do_unlinkat+0x3d2/0x5a0 fs/namei.c:4548 __do_sys_unlinkat fs/namei.c:4584 [inline] __se_sys_unlinkat fs/namei.c:4577 [inline] __x64_sys_unlinkat+0xda/0xf0 fs/namei.c:4577 x64_sys_call+0x2974/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e The buggy address belongs to the object at ffff88811e0b11a0 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 2 bytes to the right of allocated 8-byte region [ffff88811e0b11a0, ffff88811e0b11a8) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e0b1 flags: 0x4000000000000000(zone=1) page_type: f5(slab) raw: 4000000000000000 ffff888100041500 ffffea00045c6840 dead000000000002 raw: 0000000000000000 0000000080800080 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 296, tgid 296 (syz-executor), ts 39576362391, free_ts 39558041352 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1864 prep_new_page+0x2d/0x180 mm/page_alloc.c:1872 get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3949 __alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5316 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1 allocate_slab+0x69/0x430 mm/slub.c:2687 new_slab mm/slub.c:2741 [inline] ___slab_alloc+0x591/0x8c0 mm/slub.c:3934 __slab_alloc mm/slub.c:4025 [inline] __slab_alloc_node mm/slub.c:4078 [inline] slab_alloc_node mm/slub.c:4239 [inline] __do_kmalloc_node mm/slub.c:4394 [inline] __kmalloc_node_noprof+0x2e7/0x500 mm/slub.c:4401 kmalloc_node_noprof include/linux/slab.h:1008 [inline] __vmalloc_area_node mm/vmalloc.c:3674 [inline] __vmalloc_node_range_noprof+0x529/0x1300 mm/vmalloc.c:3878 __vmalloc_node_noprof mm/vmalloc.c:3949 [inline] vzalloc_noprof+0x103/0x1d0 mm/vmalloc.c:4022 xt_counters_alloc+0x6c/0xe0 net/netfilter/x_tables.c:1403 __do_replace+0xb3/0x9b0 net/ipv6/netfilter/ip6_tables.c:1063 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline] do_ip6t_set_ctl+0xa7f/0xd70 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x28d/0x2b0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x130/0x170 net/ipv6/ipv6_sockglue.c:998 tcp_setsockopt+0xef/0x110 net/ipv4/tcp.c:4064 page last free pid 919 tgid 917 stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1391 [inline] free_unref_page+0xb99/0xf50 mm/page_alloc.c:2877 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5403 free_pages+0x86/0x90 mm/page_alloc.c:5416 tlb_batch_list_free mm/mmu_gather.c:160 [inline] tlb_finish_mmu+0x117/0x1d0 mm/mmu_gather.c:524 exit_mmap+0x458/0xc20 mm/mmap.c:1989 __mmput+0x92/0x330 kernel/fork.c:1370 mmput+0x55/0x170 kernel/fork.c:1394 exit_mm kernel/exit.c:581 [inline] do_exit+0x9a5/0x2850 kernel/exit.c:948 do_group_exit+0x21f/0x2f0 kernel/exit.c:1104 get_signal+0x134c/0x1490 kernel/signal.c:2941 arch_do_signal_or_restart+0xbc/0x700 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x57/0xb0 kernel/entry/common.c:218 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84 entry_SYSCALL_64_after_hwframe+0x76/0x7e Memory state around the buggy address: ffff88811e0b1080: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff88811e0b1100: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc >ffff88811e0b1180: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ^ ffff88811e0b1200: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff88811e0b1280: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ==================================================================