ubi0: attaching mtd0 ubi0: scanning is finished ================================================================== BUG: KASAN: slab-use-after-free in notifier_chain_register+0x528/0x61a kernel/notifier.c:27 Read of size 4 at addr ff6000002ecad8e0 by task syz.2.6422/23250 CPU: 1 UID: 0 PID: 23250 Comm: syz.2.6422 Not tainted 6.13.0-rc3-syzkaller-g6f6ecce59d99 #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] print_address_description mm/kasan/report.c:378 [inline] [] print_report+0x28e/0x5aa mm/kasan/report.c:489 [] kasan_report+0xec/0x118 mm/kasan/report.c:602 [] __asan_report_load4_noabort+0x12/0x1a mm/kasan/report_generic.c:380 [] notifier_chain_register+0x528/0x61a kernel/notifier.c:27 [] __blocking_notifier_chain_register kernel/notifier.c:264 [inline] [] blocking_notifier_chain_register+0x80/0xc6 kernel/notifier.c:282 [] register_reboot_notifier+0x22/0x2c kernel/reboot.c:118 [] ubi_wl_init+0xd0a/0x15c2 drivers/mtd/ubi/wl.c:1960 [] ubi_attach+0x15da/0x4f90 drivers/mtd/ubi/attach.c:1605 [] ubi_attach_mtd_dev+0x14d8/0x3646 drivers/mtd/ubi/build.c:1004 [] ctrl_cdev_ioctl+0x496/0x764 drivers/mtd/ubi/cdev.c:1043 [] vfs_ioctl fs/ioctl.c:51 [inline] [] __do_sys_ioctl fs/ioctl.c:906 [inline] [] __se_sys_ioctl fs/ioctl.c:892 [inline] [] __riscv_sys_ioctl+0x18e/0x1e2 fs/ioctl.c:892 [] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90 [] do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331 [] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 Allocated by task 23245: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_alloc_info+0x30/0x3e mm/kasan/generic.c:568 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xa0/0xa6 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_noprof+0x258/0x5ba mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] n_hdlc_alloc_buf+0x44/0xec drivers/tty/n_hdlc.c:682 n_hdlc_alloc drivers/tty/n_hdlc.c:714 [inline] n_hdlc_tty_open+0x216/0x4b4 drivers/tty/n_hdlc.c:234 tty_ldisc_open+0x96/0x10c drivers/tty/tty_ldisc.c:432 tty_set_ldisc+0x2c8/0x68e drivers/tty/tty_ldisc.c:563 tiocsetd drivers/tty/tty_io.c:2439 [inline] tty_ioctl+0x90c/0x2004 drivers/tty/tty_io.c:2739 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __riscv_sys_ioctl+0x18e/0x1e2 fs/ioctl.c:892 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90 do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 Freed by task 23243: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x5c mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x4e/0x68 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x13e/0x508 mm/slub.c:4761 n_hdlc_free_buf_list drivers/tty/n_hdlc.c:183 [inline] n_hdlc_tty_close+0xb4/0x162 drivers/tty/n_hdlc.c:209 tty_ldisc_close+0x104/0x18c drivers/tty/tty_ldisc.c:455 tty_ldisc_kill+0x96/0x13e drivers/tty/tty_ldisc.c:613 tty_ldisc_release+0x200/0x2b8 drivers/tty/tty_ldisc.c:781 tty_release_struct+0x24/0xec drivers/tty/tty_io.c:1690 tty_release+0xb30/0x13cc drivers/tty/tty_io.c:1861 __fput+0x378/0x9ee fs/file_table.c:450 ____fput+0x1c/0x26 fs/file_table.c:478 task_work_run+0x16a/0x25e kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x302/0x316 kernel/entry/common.c:218 do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 The buggy address belongs to the object at ff6000002ecac000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6368 bytes inside of freed 8192-byte region [ff6000002ecac000, ff6000002ecae000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xaeca8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xffe000000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 0ffe000000000040 ff60000011402280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 0ffe000000000040 ff60000011402280 dead000000000100 dead000000000122 head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 0ffe000000000003 ff1c000000bb2a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 13505, tgid 13504 (syz.1.2493), ts 4537369949400, free_ts 4537305059300 __set_page_owner+0xa2/0x70c mm/page_owner.c:320 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xf0/0x1e8 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xdb0/0x2c0e mm/page_alloc.c:3474 __alloc_pages_noprof+0x1e8/0x1fc2 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0xf8/0x488 mm/mempolicy.c:2269 alloc_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2348 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2b6/0x40e mm/slub.c:2642 ___slab_alloc+0x9c8/0x10e6 mm/slub.c:3830 __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_track_caller_noprof+0x1dc/0x5e8 mm/slub.c:4317 __do_krealloc mm/slub.c:4824 [inline] krealloc_noprof+0x13e/0x350 mm/slub.c:4877 copy_array.constprop.0+0x78/0xca kernel/bpf/verifier.c:1227 copy_stack_state kernel/bpf/verifier.c:1282 [inline] copy_func_state kernel/bpf/verifier.c:1464 [inline] copy_verifier_state+0x7d2/0xc06 kernel/bpf/verifier.c:1503 is_state_visited kernel/bpf/verifier.c:18409 [inline] do_check kernel/bpf/verifier.c:18571 [inline] do_check_common+0x512e/0xe516 kernel/bpf/verifier.c:21844 do_check_main kernel/bpf/verifier.c:21935 [inline] bpf_check+0x7f56/0xc074 kernel/bpf/verifier.c:22661 bpf_prog_load+0x119e/0x2112 kernel/bpf/syscall.c:2947 page last free pid 13505 tgid 13504 stack trace: __reset_page_owner+0x8c/0x400 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x618/0x11d2 mm/page_alloc.c:2657 __free_pages+0x13a/0x1ba mm/page_alloc.c:4838 __free_slab+0xd0/0x176 mm/slub.c:2659 free_slab+0x38/0x1ae mm/slub.c:2682 discard_slab+0x42/0x5a mm/slub.c:2688 __slab_free+0x346/0x3f6 mm/slub.c:4524 do_slab_free mm/slub.c:4565 [inline] ___cache_free+0x1a4/0x1de mm/slub.c:4671 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x76/0x168 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x158/0x1ba mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x5c/0x82 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_noprof+0x216/0x5e8 mm/slub.c:4304 kmalloc_node_noprof include/linux/slab.h:928 [inline] __vmalloc_area_node mm/vmalloc.c:3645 [inline] __vmalloc_node_range_noprof+0x374/0x120e mm/vmalloc.c:3844 __vmalloc_node_noprof mm/vmalloc.c:3909 [inline] vzalloc_noprof+0xf8/0x126 mm/vmalloc.c:3982 bpf_check+0x220/0xc074 kernel/bpf/verifier.c:22566 bpf_prog_load+0x119e/0x2112 kernel/bpf/syscall.c:2947 Memory state around the buggy address: ff6000002ecad780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ff6000002ecad800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ff6000002ecad880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ff6000002ecad900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ff6000002ecad980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================