================================================================== BUG: KASAN: slab-out-of-bounds in ciCompare fs/jfs/jfs_dtree.c:3726 [inline] BUG: KASAN: slab-out-of-bounds in dtSearch+0x164c/0x2050 fs/jfs/jfs_dtree.c:645 Read of size 1 at addr ffff88807274be54 by task syz.4.56/4617 CPU: 1 PID: 4617 Comm: syz.4.56 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 ciCompare fs/jfs/jfs_dtree.c:3726 [inline] dtSearch+0x164c/0x2050 fs/jfs/jfs_dtree.c:645 jfs_lookup+0x152/0x380 fs/jfs/namei.c:1459 lookup_one_qstr_excl+0x10e/0x240 fs/namei.c:1563 filename_create+0x21e/0x450 fs/namei.c:3836 do_symlinkat+0xb3/0x6c0 fs/namei.c:4448 __do_sys_symlinkat fs/namei.c:4475 [inline] __se_sys_symlinkat fs/namei.c:4472 [inline] __x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4472 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fadaea6fc29 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:00007fadaccb6038 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007fadaecb7090 RCX: 00007fadaea6fc29 RDX: 0000200000000000 RSI: ffffffffffffff9c RDI: 0000200000001040 RBP: 00007fadaeaf2e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fadaecb7128 R14: 00007fadaecb7090 R15: 00007ffd79b256d8 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff88807274b780 which belongs to the cache jfs_ip of size 2240 The buggy address is located 1748 bytes inside of 2240-byte region [ffff88807274b780, ffff88807274c040) The buggy address belongs to the page: page:ffffea0001c9d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x72748 head:ffffea0001c9d200 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888061932901 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888146984dc0 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff888061932901 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 4617, ts 104006815360, free_ts 83289518516 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 jfs_alloc_inode+0x17/0x50 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x5f/0x210 fs/inode.c:1001 new_inode+0x25/0x1c0 fs/inode.c:1030 jfs_fill_super+0x392/0xaf0 fs/jfs/super.c:549 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3025 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc+0x127/0x330 mm/slub.c:4408 kmalloc include/linux/slab.h:609 [inline] kzalloc include/linux/slab.h:735 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x27e/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x5cd/0x610 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1cd/0x510 security/tomoyo/file.c:822 tomoyo_path_unlink+0x9f/0xe0 security/tomoyo/tomoyo.c:149 security_path_unlink+0xd8/0x130 security/security.c:1170 do_unlinkat+0x2ed/0x6f0 fs/namei.c:4344 __do_sys_unlink fs/namei.c:4396 [inline] __se_sys_unlink fs/namei.c:4394 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4394 Memory state around the buggy address: ffff88807274bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807274bd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807274be00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807274be80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807274bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================