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BUG: KASAN: slab-out-of-bounds in link_path_walk+0xf57/0x1920 fs/namei.c:2624
Read of size 1 at addr ffff888106e4982a by task syz.6.645/3000

CPU: 1 UID: 0 PID: 3000 Comm: syz.6.645 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x98/0xe0 lib/dump_stack.c:120
 print_address_description+0x72/0x210 mm/kasan/report.c:378
 print_report+0x5b/0x80 mm/kasan/report.c:482
 kasan_report+0x161/0x1a0 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:378
 link_path_walk+0xf57/0x1920 fs/namei.c:2624
 path_openat+0x2a8/0x3800 fs/namei.c:4826
 do_file_open+0x23a/0x4b0 fs/namei.c:4859
 do_sys_openat2+0x10f/0x200 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1383
 x64_sys_call+0x1e50/0x3040 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc3/0xc70 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f60b499c629
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:00007f60b5826028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f60b4c16180 RCX: 00007f60b499c629
RDX: 0000000000008000 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007f60b4a32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000004d R11: 0000000000000246 R12: 0000000000000000
R13: 00007f60b4c16218 R14: 00007f60b4c16180 R15: 00007fff49086f28
 </TASK>

Allocated by task 2995:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3a/0x70 mm/kasan/common.c:78
 kasan_save_alloc_info+0x3c/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_node_track_caller_noprof+0x277/0x510 mm/slub.c:5327
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x44/0x100 mm/util.c:84
 bpf_symlink+0x29/0x1f0 kernel/bpf/inode.c:385
 vfs_symlink+0x1c2/0x360 fs/namei.c:5615
 filename_symlinkat+0x118/0x330 fs/namei.c:5640
 __do_sys_symlinkat fs/namei.c:5660 [inline]
 __se_sys_symlinkat+0x52/0x2e0 fs/namei.c:5655
 __x64_sys_symlinkat+0x7b/0xa0 fs/namei.c:5655
 x64_sys_call+0x2b4e/0x3040 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc3/0xc70 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Freed by task 2995:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3a/0x70 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2687 [inline]
 slab_free mm/slub.c:6124 [inline]
 kfree+0x15d/0x450 mm/slub.c:6442
 bpf_destroy_inode+0x7a/0x180 kernel/bpf/inode.c:770
 destroy_inode fs/inode.c:397 [inline]
 evict+0x77d/0x950 fs/inode.c:870
 iput_final fs/inode.c:1966 [inline]
 iput+0x603/0x8e0 fs/inode.c:2015
 filename_unlinkat+0x31f/0x5f0 fs/namei.c:5544
 __do_sys_unlinkat fs/namei.c:5569 [inline]
 __se_sys_unlinkat+0x87/0x1b0 fs/namei.c:5561
 __x64_sys_unlinkat+0x7b/0xa0 fs/namei.c:5561
 x64_sys_call+0x1130/0x3040 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc3/0xc70 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

The buggy address belongs to the object at ffff888106e49820
 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 [ffff888106e49820, ffff888106e49828)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106e49
flags: 0x4000000000000000(zone=1)
page_type: f5(slab)
raw: 4000000000000000 ffff888100041500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1761265851, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x228/0x260 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x20ac/0x2140 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x2ca/0x550 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab+0x7f/0x800 mm/slub.c:3444
 new_slab mm/slub.c:3502 [inline]
 refill_objects+0x222/0x610 mm/slub.c:7134
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x1e6/0x410 mm/slub.c:4578
 alloc_from_pcs mm/slub.c:4681 [inline]
 slab_alloc_node mm/slub.c:4815 [inline]
 __do_kmalloc_node mm/slub.c:5218 [inline]
 __kmalloc_node_track_caller_noprof+0x361/0x510 mm/slub.c:5327
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x44/0x100 mm/util.c:84
 kstrdup_const+0x41/0x60 mm/util.c:104
 __kernfs_new_node+0xa7/0x730 fs/kernfs/dir.c:633
 kernfs_new_node+0x15d/0x280 fs/kernfs/dir.c:718
 kernfs_create_dir_ns+0x47/0x130 fs/kernfs/dir.c:1088
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x71c/0xc30 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x161/0x240 lib/kobject.c:426
 irq_sysfs_add kernel/irq/irqdesc.c:367 [inline]
 irq_sysfs_init+0xab/0x140 kernel/irq/irqdesc.c:399
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888106e49700: 02 fc fc fc fa fc fc fc 06 fc fc fc 05 fc fc fc
 ffff888106e49780: 05 fc fc fc fa fc fc fc 05 fc fc fc fa fc fc fc
>ffff888106e49800: fa fc fc fc fa fc fc fc 02 fc fc fc fa fc fc fc
                                  ^
 ffff888106e49880: 06 fc fc fc 06 fc fc fc 00 fc fc fc fa fc fc fc
 ffff888106e49900: 06 fc fc fc 06 fc fc fc 00 fc fc fc fa fc fc fc
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