------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:2650:28 index -128 is out of range for type 'struct dtslot[128]' CPU: 0 UID: 0 PID: 8536 Comm: syz.2.418 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 ubsan_epilogue+0x14/0x48 lib/ubsan.c:231 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:453 add_missing_indices+0x51c/0x9d8 fs/jfs/jfs_dtree.c:2650 jfs_readdir+0x1758/0x2fec fs/jfs/jfs_dtree.c:3020 wrap_directory_iterator+0x90/0xf0 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x458/0x5e0 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64 fs/readdir.c:389 [inline] __arm64_sys_getdents64+0x114/0x2fc fs/readdir.c:389 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ---[ end trace ]--- ================================================================== BUG: KASAN: slab-use-after-free in diWrite+0xd98/0x18d4 fs/jfs/jfs_imap.c:753 Read of size 32 at addr ffff0000f1c72560 by task syz.2.418/8536 CPU: 0 UID: 0 PID: 8536 Comm: syz.2.418 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x254 mm/kasan/report.c:408 print_report+0x68/0x84 mm/kasan/report.c:521 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105 diWrite+0xd98/0x18d4 fs/jfs/jfs_imap.c:753 txCommit+0x5d0/0x3e00 fs/jfs/jfs_txnmgr.c:1255 add_missing_indices+0x6b8/0x9d8 fs/jfs/jfs_dtree.c:2664 jfs_readdir+0x1758/0x2fec fs/jfs/jfs_dtree.c:3020 wrap_directory_iterator+0x90/0xf0 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x458/0x5e0 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64 fs/readdir.c:389 [inline] __arm64_sys_getdents64+0x114/0x2fc fs/readdir.c:389 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 7150: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_lru_noprof+0x23c/0x3ec mm/slub.c:4215 jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105 alloc_inode+0x68/0x19c fs/inode.c:346 new_inode+0x2c/0x130 fs/inode.c:1145 diReadSpecial+0x58/0x5e0 fs/jfs/jfs_imap.c:426 jfs_mount+0x304/0x750 fs/jfs/jfs_mount.c:166 jfs_fill_super+0x53c/0xb80 fs/jfs/super.c:523 get_tree_bdev_flags+0x360/0x414 fs/super.c:1636 get_tree_bdev+0x2c/0x3c fs/super.c:1659 jfs_get_tree+0x28/0x38 fs/jfs/super.c:635 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x228/0x814 fs/namespace.c:3881 path_mount+0x5b4/0xde0 fs/namespace.c:4208 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount fs/namespace.c:4409 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4409 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6496: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x68/0x88 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4744 jfs_free_inode+0x28/0x38 fs/jfs/super.c:116 i_callback+0x50/0x78 fs/inode.c:325 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0x848/0x17a4 kernel/rcu/tree.c:2824 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2841 handle_softirqs+0x328/0xc88 kernel/softirq.c:579 __do_softirq+0x14/0x20 kernel/softirq.c:613 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0xfc/0x96c kernel/rcu/tree.c:3202 destroy_inode fs/inode.c:401 [inline] evict+0x754/0x928 fs/inode.c:834 iput_final fs/inode.c:1898 [inline] iput+0x6e4/0x83c fs/inode.c:1924 diFreeSpecial+0x78/0x100 fs/jfs/jfs_imap.c:552 jfs_umount+0x15c/0x350 fs/jfs/jfs_umount.c:65 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1431 __cleanup_mnt+0x20/0x30 fs/namespace.c:1438 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x16c/0x1ec arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb4/0x17c arch/arm64/kernel/entry-common.c:768 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000f1c724e0 which belongs to the cache jfs_ip of size 2232 The buggy address is located 128 bytes inside of freed 2232-byte region [ffff0000f1c724e0, ffff0000f1c72d98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131c70 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000f17c1501 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c47768c0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000f17c1501 head: 05ffc00000000040 ffff0000c47768c0 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000f17c1501 head: 05ffc00000000003 fffffdffc3c71c01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f1c72400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff0000f1c72480: fc fc fc fc fc fc fc fc fc fc fc fc fa fb fb fb >ffff0000f1c72500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f1c72580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f1c72600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ... Log Wrap ... Log Wrap ... Log Wrap ... ... Log Wrap ... Log Wrap ... Log Wrap ... ... Log Wrap ... Log Wrap ... Log Wrap ... ERROR: (device loop2): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 0 ERROR: (device loop2): remounting filesystem as read-only JFS: Invalid stbl[1] = -128 for inode 2, block = 0