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BUG: KASAN: slab-out-of-bounds in ciCompare fs/jfs/jfs_dtree.c:3428 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645
Read of size 1 at addr ffff88805fe303e4 by task syz.4.105/6695

CPU: 0 UID: 0 PID: 6695 Comm: syz.4.105 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ciCompare fs/jfs/jfs_dtree.c:3428 [inline]
 dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645
 jfs_lookup+0x1b0/0x420 fs/jfs/namei.c:1464
 lookup_open fs/namei.c:4462 [inline]
 open_last_lookups fs/namei.c:4589 [inline]
 path_openat+0x11cb/0x38a0 fs/namei.c:4833
 do_file_open+0x23e/0x4a0 fs/namei.c:4865
 do_sys_openat2+0x113/0x200 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+0x138/0x170 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f646aaec819
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:00007f6468d3e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f646ad65fa0 RCX: 00007f646aaec819
RDX: 0000000000028000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f646ab82c91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000009f R11: 0000000000000246 R12: 0000000000000000
R13: 00007f646ad66038 R14: 00007f646ad65fa0 R15: 00007ffcee36fa38
 </TASK>

The buggy address belongs to the object at ffff88805fe30000
 which belongs to the cache fuse_inode of size 1968
The buggy address is located 996 bytes inside of
 allocated 1968-byte region [ffff88805fe30000, ffff88805fe307b0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805fe35ac0 pfn:0x5fe30
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88805fe37bc1
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff888140438500 ffff88801cfb9688 ffff88801cfb9688
raw: ffff88805fe35ac0 00000008000f000b 00000000f5000000 ffff88805fe37bc1
head: 0080000000000240 ffff888140438500 ffff88801cfb9688 ffff88801cfb9688
head: ffff88805fe35ac0 00000008000f000b 00000000f5000000 ffff88805fe37bc1
head: 0080000000000003 ffffea00017f8c01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 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 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5936, tgid 5935 (syz.4.5), ts 93731660145, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x334/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 alloc_full_sheaf mm/slub.c:2834 [inline]
 __pcs_replace_empty_main+0x480/0x710 mm/slub.c:4626
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 kmem_cache_alloc_lru_noprof+0x433/0x680 mm/slub.c:4885
 fuse_alloc_inode+0x2e/0x1a0 fs/fuse/inode.c:102
 alloc_inode+0x6a/0x1b0 fs/inode.c:347
 iget5_locked+0x4a/0xa0 fs/inode.c:1388
 fuse_iget+0x381/0x9b0 fs/fuse/inode.c:504
 fuse_get_root_inode fs/fuse/inode.c:1065 [inline]
 fuse_fill_super_common+0xa75/0x1270 fs/fuse/inode.c:1889
 fuse_fill_super+0x182/0x200 fs/fuse/inode.c:1950
 vfs_get_super fs/super.c:1327 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1346
 fuse_get_tree+0x304/0x500 fs/fuse/inode.c:2027
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88805fe30280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805fe30300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805fe30380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff88805fe30400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805fe30480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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