================================================================== BUG: KASAN: slab-out-of-bounds in link_path_walk+0x9ea/0xec0 fs/namei.c:2403 Read of size 1 at addr ffff888108b8d96a by task syz.5.1983/6064 CPU: 0 UID: 0 PID: 6064 Comm: syz.5.1983 Not tainted syzkaller #0 aabe2a8d9bec8174329175b232e2b958564b20c6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0x9ea/0xec0 fs/namei.c:2403 path_parentat fs/namei.c:2635 [inline] __filename_parentat+0x22a/0x650 fs/namei.c:2659 filename_parentat fs/namei.c:2677 [inline] do_unlinkat+0xfe/0x5a0 fs/namei.c:4516 __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 RIP: 0033:0x7ff80779bf79 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:00007ff80857b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007ff807a15fa0 RCX: 00007ff80779bf79 RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000004 RBP: 00007ff8078327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff807a16038 R14: 00007ff807a15fa0 R15: 00007fff32947d88 Allocated by task 6064: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_alloc_info+0x40/0x50 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+0x251/0x4f0 mm/slub.c:4414 kstrdup+0x4d/0x130 mm/util.c:70 bpf_symlink+0x2d/0x200 kernel/bpf/inode.c:386 vfs_symlink+0x3ee/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 6067: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_free_info+0x4a/0x60 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:4871 bpf_destroy_inode+0x7e/0x180 kernel/bpf/inode.c:783 destroy_inode fs/inode.c:319 [inline] evict+0x7f5/0xac0 fs/inode.c:762 iput_final fs/inode.c:1890 [inline] iput+0x635/0x8d0 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 ffff888108b8d960 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 [ffff888108b8d960, ffff888108b8d968) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108b8d flags: 0x4000000000000000(zone=1) page_type: f5(slab) raw: 4000000000000000 ffff888100041500 ffffea00046541c0 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 5066856547, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x3b8/0x3f0 mm/page_alloc.c:1864 prep_new_page+0x20/0x120 mm/page_alloc.c:1872 get_page_from_freelist+0x496e/0x4a20 mm/page_alloc.c:3948 __alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5298 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1 allocate_slab+0x69/0x420 mm/slub.c:2687 new_slab mm/slub.c:2741 [inline] ___slab_alloc+0x5a2/0x8d0 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_track_caller_noprof+0x2e6/0x4f0 mm/slub.c:4414 kstrdup+0x4d/0x130 mm/util.c:70 kstrdup_const+0x45/0x60 mm/util.c:93 __kernfs_new_node+0xaa/0x740 fs/kernfs/dir.c:620 kernfs_new_node+0x154/0x280 fs/kernfs/dir.c:700 kernfs_create_dir_ns+0x4b/0x130 fs/kernfs/dir.c:1061 sysfs_create_dir_ns+0x127/0x210 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x71b/0xc30 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_init_and_add+0x12c/0x1a0 lib/kobject.c:457 page_owner free stack trace missing Memory state around the buggy address: ffff888108b8d800: 07 fc fc fc 04 fc fc fc 04 fc fc fc fa fc fc fc ffff888108b8d880: fa fc fc fc fa fc fc fc fa fc fc fc 06 fc fc fc >ffff888108b8d900: fa fc fc fc fa fc fc fc 04 fc fc fc fa fc fc fc ^ ffff888108b8d980: fa fc fc fc fa fc fc fc 05 fc fc fc fa fc fc fc ffff888108b8da00: fa fc fc fc 07 fc fc fc fa fc fc fc 04 fc fc fc ==================================================================