================================================================== BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:981 [inline] BUG: KASAN: slab-use-after-free in hlist_del_init include/linux/list.h:1008 [inline] BUG: KASAN: slab-use-after-free in binderfs_evict_inode+0xe8/0x114 drivers/android/binderfs.c:277 Write at addr fbf0000003d73b48 by task syz-executor/3297 Pointer tag: [fb], memory tag: [fe] CPU: 0 UID: 0 PID: 3297 Comm: syz-executor Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x108/0x630 mm/kasan/report.c:521 kasan_report+0x88/0xac mm/kasan/report.c:634 report_tag_fault arch/arm64/mm/fault.c:332 [inline] do_tag_recovery arch/arm64/mm/fault.c:344 [inline] __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:386 do_bad_area arch/arm64/mm/fault.c:486 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:843 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:919 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0xa4/0x120 arch/arm64/kernel/entry-common.c:510 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 __hlist_del include/linux/list.h:981 [inline] (P) hlist_del_init include/linux/list.h:1008 [inline] (P) binderfs_evict_inode+0xe8/0x114 drivers/android/binderfs.c:277 (P) evict+0xec/0x240 fs/inode.c:810 iput_final fs/inode.c:1898 [inline] iput fs/inode.c:1924 [inline] iput+0xfc/0x1b8 fs/inode.c:1910 dentry_unlink_inode+0xc0/0x188 fs/dcache.c:457 __dentry_kill+0x7c/0x1d4 fs/dcache.c:660 shrink_kill fs/dcache.c:1105 [inline] shrink_dentry_list+0x74/0xe4 fs/dcache.c:1132 shrink_dcache_parent+0xcc/0x14c fs/dcache.c:1566 do_one_tree fs/dcache.c:1595 [inline] shrink_dcache_for_umount+0x3c/0x1c8 fs/dcache.c:1612 generic_shutdown_super+0x24/0x100 fs/super.c:620 kill_anon_super+0x20/0x90 fs/super.c:1237 kill_litter_super+0x28/0x38 fs/super.c:1247 binderfs_kill_super+0x18/0x40 drivers/android/binderfs.c:792 deactivate_locked_super+0x50/0x12c fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0x84/0x9c fs/super.c:502 cleanup_mnt+0xf4/0x184 fs/namespace.c:1435 __cleanup_mnt+0x14/0x20 fs/namespace.c:1442 task_work_run+0x78/0xd4 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x2c8/0x944 kernel/exit.c:953 do_group_exit+0x34/0x90 kernel/exit.c:1102 copy_siginfo_to_user+0x0/0xec kernel/signal.c:3034 do_signal+0x94/0x360 arch/arm64/kernel/signal.c:1658 do_notify_resume+0xd8/0x164 arch/arm64/kernel/entry-common.c:148 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+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600 Freed by task 3296: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 save_stack_info+0x40/0x158 mm/kasan/tags.c:106 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x74/0x8c 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] kfree+0xfc/0x30c mm/slub.c:4841 binderfs_evict_inode+0x100/0x114 drivers/android/binderfs.c:279 evict+0xec/0x240 fs/inode.c:810 iput_final fs/inode.c:1898 [inline] iput fs/inode.c:1924 [inline] iput+0xfc/0x1b8 fs/inode.c:1910 dentry_unlink_inode+0xc0/0x188 fs/dcache.c:457 __dentry_kill+0x7c/0x1d4 fs/dcache.c:660 shrink_kill fs/dcache.c:1105 [inline] shrink_dentry_list+0x74/0xe4 fs/dcache.c:1132 shrink_dcache_parent+0xcc/0x14c fs/dcache.c:1566 do_one_tree fs/dcache.c:1595 [inline] shrink_dcache_for_umount+0x3c/0x1c8 fs/dcache.c:1612 generic_shutdown_super+0x24/0x100 fs/super.c:620 kill_anon_super+0x20/0x90 fs/super.c:1237 kill_litter_super+0x28/0x38 fs/super.c:1247 binderfs_kill_super+0x18/0x40 drivers/android/binderfs.c:792 deactivate_locked_super+0x50/0x12c fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0x84/0x9c fs/super.c:502 cleanup_mnt+0xf4/0x184 fs/namespace.c:1435 __cleanup_mnt+0x14/0x20 fs/namespace.c:1442 task_work_run+0x78/0xd4 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x2c8/0x944 kernel/exit.c:953 do_group_exit+0x34/0x90 kernel/exit.c:1102 copy_siginfo_to_user+0x0/0xec kernel/signal.c:3034 do_signal+0x94/0x360 arch/arm64/kernel/signal.c:1658 do_notify_resume+0xd8/0x164 arch/arm64/kernel/entry-common.c:148 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+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at fff0000003d73b40 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of 192-byte region [fff0000003d73b40, fff0000003d73c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43d73 flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) page_type: f5(slab) raw: 01ffc00000000000 fbf0000003001300 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080150015 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff0000003d73900: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 fe fe fe fe fff0000003d73a00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >fff0000003d73b00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ fff0000003d73c00: fe fe fe fe fe fe fe fe fe fe fe fe fb fb fb fb fff0000003d73d00: fb fb fb fb fb fb fb fb fe fe fe fe fe fe fe fe ==================================================================