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BUG: KASAN: slab-out-of-bounds in ciCompare fs/jfs/jfs_dtree.c:3416 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x16cb/0x2570 fs/jfs/jfs_dtree.c:645
Read of size 1 at addr ffff88807cc834f4 by task syz.4.164/7324

CPU: 0 UID: 0 PID: 7324 Comm: syz.4.164 Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 ciCompare fs/jfs/jfs_dtree.c:3416 [inline]
 dtSearch+0x16cb/0x2570 fs/jfs/jfs_dtree.c:645
 jfs_lookup+0x18b/0x440 fs/jfs/namei.c:1461
 __lookup_slow+0x2b1/0x400 fs/namei.c:1817
 lookup_slow+0x53/0x70 fs/namei.c:1834
 walk_component+0x2f4/0x420 fs/namei.c:2138
 lookup_last fs/namei.c:2636 [inline]
 path_lookupat+0x169/0x440 fs/namei.c:2660
 filename_lookup+0x290/0x670 fs/namei.c:2689
 user_path_at+0x3a/0x60 fs/namei.c:3120
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4432 [inline]
 __se_sys_mount+0x348/0x400 fs/namespace.c:4409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00fe78e169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00ff684038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f00fe9b6160 RCX: 00007f00fe78e169
RDX: 0000200000000000 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 00007f00fe810a68 R08: 00002000000002c0 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00fe9b6160 R15: 00007ffcaf198cd8
 </TASK>

The buggy address belongs to the object at ffff88807cc82e18
 which belongs to the cache jfs_ip of size 2232
The buggy address is located 1756 bytes inside of
 allocated 2232-byte region [ffff88807cc82e18, ffff88807cc836d0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cc80
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880313e1e01
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff888143afbc80 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff8880313e1e01
head: 00fff00000000040 ffff888143afbc80 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000000f5000000 ffff8880313e1e01
head: 00fff00000000003 ffffea0001f32001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7297, tgid 7296 (syz.4.164), ts 197049573413, free_ts 194928575321
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x360d/0x37b0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4970
 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2468 [inline]
 allocate_slab+0x8f/0x3b0 mm/slub.c:2632
 new_slab mm/slub.c:2686 [inline]
 ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872
 __slab_alloc+0x58/0xa0 mm/slub.c:3962
 __slab_alloc_node mm/slub.c:4037 [inline]
 slab_alloc_node mm/slub.c:4198 [inline]
 kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4229
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x69/0x1b0 fs/inode.c:346
 new_inode+0x22/0x180 fs/inode.c:1145
 diReadSpecial+0x52/0x720 fs/jfs/jfs_imap.c:426
 jfs_mount+0x75/0x830 fs/jfs/jfs_mount.c:87
 jfs_fill_super+0x6b9/0xd90 fs/jfs/super.c:523
 get_tree_bdev_flags+0x490/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
page last free pid 7267 tgid 7267 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 __free_frozen_pages+0xddf/0x10a0 mm/page_alloc.c:2725
 discard_slab mm/slub.c:2730 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3199
 put_cpu_partial+0x17e/0x250 mm/slub.c:3274
 __slab_free+0x294/0x390 mm/slub.c:4526
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4161 [inline]
 slab_alloc_node mm/slub.c:4210 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_noprof+0x238/0x4d0 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:909 [inline]
 tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x2be/0x640 security/tomoyo/file.c:822
 security_inode_getattr+0x130/0x330 security/security.c:2377
 vfs_getattr fs/stat.c:256 [inline]
 vfs_fstat fs/stat.c:278 [inline]
 vfs_fstatat+0xa5/0x150 fs/stat.c:370
 __do_sys_newfstatat fs/stat.c:536 [inline]
 __se_sys_newfstatat fs/stat.c:530 [inline]
 __x64_sys_newfstatat+0x11f/0x1a0 fs/stat.c:530
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807cc83380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807cc83400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807cc83480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff88807cc83500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807cc83580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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