ubi0: attaching mtd0 ubi0: scanning is finished ================================================================== BUG: KASAN: slab-use-after-free in notifier_chain_register+0x108/0x4e0 kernel/notifier.c:27 Read of size 4 at addr ffff0000d45618e8 by task syz.3.1584/12423 CPU: 1 UID: 0 PID: 12423 Comm: syz.3.1584 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:378 [inline] print_report+0x198/0x538 mm/kasan/report.c:489 kasan_report+0xd8/0x138 mm/kasan/report.c:602 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 notifier_chain_register+0x108/0x4e0 kernel/notifier.c:27 __blocking_notifier_chain_register kernel/notifier.c:264 [inline] blocking_notifier_chain_register+0x88/0xd8 kernel/notifier.c:282 register_reboot_notifier+0x28/0x38 kernel/reboot.c:118 ubi_wl_init+0x2914/0x2c08 drivers/mtd/ubi/wl.c:1960 ubi_attach+0x2f44/0x47d0 drivers/mtd/ubi/attach.c:1605 ubi_attach_mtd_dev+0x124c/0x2864 drivers/mtd/ubi/build.c:1004 ctrl_cdev_ioctl+0x43c/0x714 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] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __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 12233: 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:568 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_node_track_caller_noprof+0x334/0x558 mm/slub.c:4317 memdup_user+0x4c/0x218 mm/util.c:218 copy_dev_ioctl fs/autofs/dev-ioctl.c:95 [inline] _autofs_dev_ioctl fs/autofs/dev-ioctl.c:706 [inline] autofs_dev_ioctl+0x2e0/0xb08 fs/autofs/dev-ioctl.c:779 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __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 12233: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x180/0x478 mm/slub.c:4761 memdup_user+0x168/0x218 mm/util.c:223 copy_dev_ioctl fs/autofs/dev-ioctl.c:95 [inline] _autofs_dev_ioctl fs/autofs/dev-ioctl.c:706 [inline] autofs_dev_ioctl+0x2e0/0xb08 fs/autofs/dev-ioctl.c:779 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __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 ffff0000d4560000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6376 bytes inside of freed 8192-byte region [ffff0000d4560000, ffff0000d4562000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114560 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002280 fffffdffc3cf3a00 dead000000000005 raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002280 fffffdffc3cf3a00 dead000000000005 head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3515801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d4561780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d4561800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d4561880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d4561900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d4561980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 3715987836 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0