================================================================== BUG: KASAN: use-after-free in write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] BUG: KASAN: use-after-free in lmLogSync+0x1e4/0x978 fs/jfs/jfs_logmgr.c:937 Read of size 8 at addr ffff0000e22a4520 by task syz-executor.3/4259 CPU: 0 PID: 4259 Comm: syz-executor.3 Not tainted 6.1.29-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lmLogSync+0x1e4/0x978 fs/jfs/jfs_logmgr.c:937 jfs_syncpt+0x74/0x98 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x8c/0xac fs/jfs/super.c:685 sync_filesystem+0xe8/0x218 fs/sync.c:56 generic_shutdown_super+0x70/0x328 fs/super.c:474 kill_block_super+0x70/0xdc fs/super.c:1450 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Allocated by task 7860: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x1ac/0x2f8 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3131 [inline] jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105 alloc_inode fs/inode.c:259 [inline] new_inode_pseudo+0x68/0x1d0 fs/inode.c:1018 new_inode+0x38/0x174 fs/inode.c:1046 diReadSpecial+0x58/0x5a0 fs/jfs/jfs_imap.c:422 jfs_mount+0x170/0x7a4 fs/jfs/jfs_mount.c:108 jfs_fill_super+0x464/0x9f0 fs/jfs/super.c:556 mount_bdev+0x26c/0x368 fs/super.c:1423 jfs_do_mount+0x44/0x58 fs/jfs/super.c:670 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610 vfs_get_tree+0x90/0x274 fs/super.c:1553 do_new_mount+0x25c/0x8c8 fs/namespace.c:3040 path_mount+0x590/0xe58 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Freed by task 7877: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x2f0/0x588 mm/slub.c:3683 jfs_free_inode+0x28/0x38 fs/jfs/super.c:116 i_callback+0x50/0x78 fs/inode.c:248 rcu_do_batch kernel/rcu/tree.c:2251 [inline] rcu_core+0x878/0x1c10 kernel/rcu/tree.c:2511 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2528 __do_softirq+0x30c/0xea0 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2799 destroy_inode fs/inode.c:314 [inline] evict+0x5fc/0x68c fs/inode.c:679 iput_final fs/inode.c:1747 [inline] iput+0x7c0/0x8a4 fs/inode.c:1773 diFreeSpecial+0x78/0x108 fs/jfs/jfs_imap.c:548 jfs_umount+0x1d4/0x338 fs/jfs/jfs_umount.c:91 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1450 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2799 destroy_inode fs/inode.c:314 [inline] evict+0x5fc/0x68c fs/inode.c:679 dispose_list fs/inode.c:697 [inline] evict_inodes+0x6b4/0x74c fs/inode.c:747 generic_shutdown_super+0x9c/0x328 fs/super.c:480 kill_block_super+0x70/0xdc fs/super.c:1450 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 The buggy address belongs to the object at ffff0000e22a40c0 which belongs to the cache jfs_ip of size 2240 The buggy address is located 1120 bytes inside of 2240-byte region [ffff0000e22a40c0, ffff0000e22a4980) The buggy address belongs to the physical page: page:0000000028f61031 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1222a0 head:0000000028f61031 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000c6302001 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c6f13b00 raw: 0000000000000000 00000000000d000d 00000001ffffffff ffff0000c6302001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e22a4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e22a4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000e22a4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e22a4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e22a4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000006 KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000006] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4259 Comm: syz-executor.3 Tainted: G B 6.1.29-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] pc : lmLogSync+0x210/0x978 fs/jfs/jfs_logmgr.c:937 lr : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lr : lmLogSync+0x1ec/0x978 fs/jfs/jfs_logmgr.c:937 sp : ffff80001dcc7700 x29: ffff80001dcc77d0 x28: 1ffff00002ab3aa9 x27: dfff800000000000 x26: 0000000000000002 x25: ffff80001dcc7720 x24: 1fffe0001bc91806 x23: dfff800000000000 x22: 0000000000000000 x21: 0000000000000030 x20: ffff0000c9298c38 x19: ffff0000f44a8800 x18: 1fffe000368b6376 x17: ffff80001559d000 x16: ffff80001203ab40 x15: 0000000000000000 x14: 0000000000000000 x13: 746e696174206c65 x12: 0000000000000003 x11: ff808000087416c8 x10: 0000000000000000 x9 : 12c7dfb59e92bc00 x8 : 0000000000000006 x7 : 0000000000000000 x6 : ffff800008343284 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008741788 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] lmLogSync+0x210/0x978 fs/jfs/jfs_logmgr.c:937 jfs_syncpt+0x74/0x98 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x8c/0xac fs/jfs/super.c:685 sync_filesystem+0xe8/0x218 fs/sync.c:56 generic_shutdown_super+0x70/0x328 fs/super.c:474 kill_block_super+0x70/0xdc fs/super.c:1450 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 97bef2e2 f94002a8 9100c115 d343fea8 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97bef2e2 bl 0xfffffffffefbcb88 4: f94002a8 ldr x8, [x21] 8: 9100c115 add x21, x8, #0x30 c: d343fea8 lsr x8, x21, #3 * 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction