================================================================== BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x12ca/0x3b10 fs/jfs/jfs_dtree.c:-1 Read of size 1 at addr ffff88805d5565b5 by task syz.3.1469/13232 CPU: 0 PID: 13232 Comm: syz.3.1469 Not tainted 6.6.100-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x200 mm/kasan/report.c:466 kasan_report+0x117/0x150 mm/kasan/report.c:579 dtSplitPage+0x12ca/0x3b10 fs/jfs/jfs_dtree.c:-1 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0x108f/0x5f40 fs/jfs/jfs_dtree.c:871 jfs_symlink+0x719/0xe50 fs/jfs/namei.c:1019 vfs_symlink+0x138/0x2b0 fs/namei.c:4473 do_symlinkat+0x1b2/0x3f0 fs/namei.c:4499 __do_sys_symlink fs/namei.c:4520 [inline] __se_sys_symlink fs/namei.c:4518 [inline] __x64_sys_symlink+0x7e/0x90 fs/namei.c:4518 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fce0fd8e9a9 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:00007fce10c53038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007fce0ffb6160 RCX: 00007fce0fd8e9a9 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000200000000080 RBP: 00007fce0fe10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fce0ffb6160 R15: 00007ffc109f3658 Allocated by task 13211: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc_lru+0x115/0x2e0 mm/slub.c:3516 alloc_inode_sb include/linux/fs.h:2946 [inline] jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] iget_locked+0x1ad/0x840 fs/inode.c:1359 jfs_iget+0x24/0x3c0 fs/jfs/inode.c:29 jfs_lookup+0x1c6/0x380 fs/jfs/namei.c:1467 __lookup_slow+0x281/0x3b0 fs/namei.c:1694 lookup_slow+0x53/0x70 fs/namei.c:1711 walk_component+0x2be/0x3f0 fs/namei.c:2002 lookup_last fs/namei.c:2459 [inline] path_lookupat+0x169/0x440 fs/namei.c:2483 filename_lookup+0x1f4/0x510 fs/namei.c:2512 user_path_at_empty+0x42/0x60 fs/namei.c:2909 user_path_at include/linux/namei.h:57 [inline] __do_sys_chdir fs/open.c:551 [inline] __se_sys_chdir+0x95/0x290 fs/open.c:545 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2721 [inline] call_rcu+0x158/0x930 kernel/rcu/tree.c:2837 destroy_inode fs/inode.c:316 [inline] evict+0x7db/0x870 fs/inode.c:720 jfs_umount+0x228/0x3c0 fs/jfs/jfs_umount.c:81 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88805d555c80 which belongs to the cache jfs_ip of size 2240 The buggy address is located 117 bytes to the right of allocated 2240-byte region [ffff88805d555c80, ffff88805d556540) The buggy address belongs to the physical page: page:ffffea0001755400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805d554a00 pfn:0x5d550 head:ffffea0001755400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88807f03a901 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888018f83640 0000000000000000 0000000000000001 raw: ffff88805d554a00 00000000800d000a 00000001ffffffff ffff88807f03a901 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 6015, tgid 6013 (syz.3.24), ts 85894939923, free_ts 84712239773 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc_lru+0x1ae/0x2e0 mm/slub.c:3516 alloc_inode_sb include/linux/fs.h:2946 [inline] jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x63/0x1d0 fs/inode.c:1049 new_inode+0x22/0x1b0 fs/inode.c:1075 jfs_fill_super+0x396/0xac0 fs/jfs/super.c:544 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3371 do_mount fs/namespace.c:3711 [inline] __do_sys_mount fs/namespace.c:3920 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509 getname_flags+0xbb/0x500 fs/namei.c:140 user_path_at_empty+0x2c/0x60 fs/namei.c:2908 user_path_at include/linux/namei.h:57 [inline] do_utimes_path fs/utimes.c:95 [inline] do_utimes+0x13c/0x2a0 fs/utimes.c:145 __do_sys_utimensat fs/utimes.c:164 [inline] __se_sys_utimensat fs/utimes.c:148 [inline] __x64_sys_utimensat+0x150/0x230 fs/utimes.c:148 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88805d556480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805d556500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88805d556580: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88805d556600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805d556680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================