------------[ 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: 1 UID: 0 PID: 7369 Comm: syz.5.115 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #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 lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x1028 lib/dump_stack.c:129 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf8/0x148 lib/ubsan.c:453 add_missing_indices+0x700/0xac8 fs/jfs/jfs_dtree.c:2650 jfs_readdir+0x198c/0x3338 fs/jfs/jfs_dtree.c:3020 wrap_directory_iterator+0xa8/0xf4 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x46c/0x5f4 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64 fs/readdir.c:389 [inline] __arm64_sys_getdents64+0x1c0/0x490 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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ---[ end trace ]--- ================================================================== BUG: KASAN: slab-use-after-free in add_missing_indices+0x5f0/0xac8 fs/jfs/jfs_dtree.c:2651 Read of size 4 at addr ffff0000f15b61ac by task syz.5.115/7369 CPU: 1 UID: 0 PID: 7369 Comm: syz.5.115 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #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 lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x198/0x550 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 add_missing_indices+0x5f0/0xac8 fs/jfs/jfs_dtree.c:2651 jfs_readdir+0x198c/0x3338 fs/jfs/jfs_dtree.c:3020 wrap_directory_iterator+0xa8/0xf4 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x46c/0x5f4 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64 fs/readdir.c:389 [inline] __arm64_sys_getdents64+0x1c0/0x490 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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 7162: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_lru_noprof+0x258/0x414 mm/slub.c:4219 jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105 alloc_inode+0x68/0x19c fs/inode.c:346 new_inode+0x2c/0x134 fs/inode.c:1145 diReadSpecial+0x58/0x624 fs/jfs/jfs_imap.c:426 jfs_mount+0x170/0x7a8 fs/jfs/jfs_mount.c:108 jfs_fill_super+0x55c/0xba0 fs/jfs/super.c:523 get_tree_bdev_flags+0x38c/0x494 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+0x278/0x900 fs/namespace.c:3879 path_mount+0x590/0xe04 fs/namespace.c:4206 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount fs/namespace.c:4407 [inline] __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4407 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6945: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free mm/slub.c:4646 [inline] kmem_cache_free+0x198/0x554 mm/slub.c:4748 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+0x898/0x1b5c kernel/rcu/tree.c:2824 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2841 handle_softirqs+0x320/0xd34 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+0xb4/0xcc mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0x104/0xb9c kernel/rcu/tree.c:3202 destroy_inode fs/inode.c:401 [inline] evict+0x790/0x958 fs/inode.c:834 iput_final fs/inode.c:1898 [inline] iput+0x740/0x8e8 fs/inode.c:1924 diFreeSpecial+0x78/0x108 fs/jfs/jfs_imap.c:552 jfs_mount+0x540/0x7a8 fs/jfs/jfs_mount.c:203 jfs_fill_super+0x55c/0xba0 fs/jfs/super.c:523 get_tree_bdev_flags+0x38c/0x494 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+0x278/0x900 fs/namespace.c:3879 path_mount+0x590/0xe04 fs/namespace.c:4206 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount fs/namespace.c:4407 [inline] __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4407 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000f15b5c30 which belongs to the cache jfs_ip of size 2232 The buggy address is located 1404 bytes inside of freed 2232-byte region [ffff0000f15b5c30, ffff0000f15b64e8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1315b0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000dc90c201 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c3e0e500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000dc90c201 head: 05ffc00000000040 ffff0000c3e0e500 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000dc90c201 head: 05ffc00000000003 fffffdffc3c56c01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f15b6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f15b6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f15b6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f15b6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f15b6280: 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 loop5): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 0 ERROR: (device loop5): remounting filesystem as read-only JFS: Invalid stbl[1] = -128 for inode 2, block = 0