================================================================== BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125 Read of size 8 at addr ffff8880b2a9ab00 by task syz-executor331/8097 CPU: 0 PID: 8097 Comm: syz-executor331 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125 bfs_create+0xfb/0x610 fs/bfs/dir.c:91 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f831f4ba0c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcaad50fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f831f4ba0c9 RDX: 00007f831f4783d3 RSI: 0000000000000000 RDI: 0000000020000940 RBP: 00007f831f4796a0 R08: 0000555556a9e2c0 R09: 0000000000000000 R10: 00007ffcaad50e90 R11: 0000000000000246 R12: 00007f831f479730 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8097: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kzalloc include/linux/slab.h:709 [inline] bfs_fill_super+0x447/0xec0 fs/bfs/inode.c:363 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 acpi_os_free include/acpi/platform/aclinuxex.h:62 [inline] acpi_ut_delete_internal_obj drivers/acpi/acpica/utdelete.c:294 [inline] acpi_ut_update_ref_count drivers/acpi/acpica/utdelete.c:423 [inline] acpi_ut_update_ref_count+0x93d/0xa26 drivers/acpi/acpica/utdelete.c:353 acpi_ut_update_object_reference+0x4ae/0x595 drivers/acpi/acpica/utdelete.c:618 acpi_ut_remove_reference drivers/acpi/acpica/utdelete.c:726 [inline] acpi_ut_remove_reference+0x76/0x7d drivers/acpi/acpica/utdelete.c:696 acpi_ds_clear_implicit_return drivers/acpi/acpica/dsutils.c:55 [inline] acpi_ds_clear_implicit_return+0x95/0xc7 drivers/acpi/acpica/dsutils.c:34 acpi_ds_do_implicit_return drivers/acpi/acpica/dsutils.c:107 [inline] acpi_ds_do_implicit_return+0xbc/0x116 drivers/acpi/acpica/dsutils.c:80 acpi_ds_is_result_used+0x71/0x388 drivers/acpi/acpica/dsutils.c:157 acpi_ds_delete_result_if_not_used+0xa0/0x117 drivers/acpi/acpica/dsutils.c:321 acpi_ds_exec_end_op+0xd9c/0xe17 drivers/acpi/acpica/dswexec.c:707 acpi_ps_parse_loop+0x1672/0x19a8 drivers/acpi/acpica/psloop.c:721 acpi_ps_parse_aml+0x212/0x829 drivers/acpi/acpica/psparse.c:475 acpi_ps_execute_method+0x525/0x59a drivers/acpi/acpica/psxface.c:187 acpi_ns_evaluate+0x6c1/0x960 drivers/acpi/acpica/nseval.c:204 acpi_evaluate_object+0x4d3/0x8ff drivers/acpi/acpica/nsxfeval.c:354 map_mat_entry+0x94/0x980 drivers/acpi/processor_core.c:171 acpi_get_phys_id+0x1f/0xf0 drivers/acpi/processor_core.c:202 acpi_processor_get_info drivers/acpi/acpi_processor.c:295 [inline] acpi_processor_add+0x78c/0x1500 drivers/acpi/acpi_processor.c:392 acpi_scan_attach_handler drivers/acpi/scan.c:1990 [inline] acpi_bus_attach+0x343/0x970 drivers/acpi/scan.c:2034 acpi_bus_attach+0x173/0x970 drivers/acpi/scan.c:2055 acpi_bus_attach+0x173/0x970 drivers/acpi/scan.c:2055 acpi_bus_scan+0xa3/0x110 drivers/acpi/scan.c:2107 acpi_scan_init+0x26d/0x705 drivers/acpi/scan.c:2260 acpi_init+0x6a5/0x74d drivers/acpi/bus.c:1250 do_one_initcall+0xf1/0x740 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x9c5/0xab7 init/main.c:1145 kernel_init+0xd/0x1ba init/main.c:1062 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880b2a9ab00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8880b2a9ab00, ffff8880b2a9ab20) The buggy address belongs to the page: page:ffffea0002caa680 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880b2a9afc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002cbb688 ffffea0002c4e248 ffff88813bff01c0 raw: ffff8880b2a9afc1 ffff8880b2a9a000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b2a9aa00: 00 04 fc fc fc fc fc fc 00 06 fc fc fc fc fc fc ffff8880b2a9aa80: 00 03 fc fc fc fc fc fc 00 03 fc fc fc fc fc fc >ffff8880b2a9ab00: 07 fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff8880b2a9ab80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc ffff8880b2a9ac00: 00 00 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc ==================================================================