================================================================== BUG: KASAN: use-after-free in get_disk_and_module block/genhd.c:1787 [inline] BUG: KASAN: use-after-free in exact_lock+0x38/0xc0 block/genhd.c:677 Read of size 8 at addr ffff888101796460 by task syz.0.1423/6017 CPU: 0 PID: 6017 Comm: syz.0.1423 Tainted: G W 5.10.238-syzkaller-00282-gd76d4cd0623a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 get_disk_and_module block/genhd.c:1787 [inline] exact_lock+0x38/0xc0 block/genhd.c:677 kobj_lookup+0x298/0x430 drivers/base/map.c:119 get_gendisk+0xe9/0x340 block/genhd.c:1001 bdev_get_gendisk fs/block_dev.c:1110 [inline] __blkdev_get+0x1b0/0x12f0 fs/block_dev.c:1474 blkdev_get fs/block_dev.c:1653 [inline] blkdev_open+0x208/0x430 fs/block_dev.c:1770 do_dentry_open+0x793/0x1090 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x27ad/0x3160 fs/namei.c:3509 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1244 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fb9e9bfe929 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb9e8267038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb9e9e25fa0 RCX: 00007fb9e9bfe929 RDX: 0000000000048080 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007fb9e9c80b39 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb9e9e25fa0 R15: 00007ffc31fbf0f8 Allocated by task 5889: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a7/0x330 mm/slub.c:4033 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:314 [inline] bpf_map_area_alloc+0x49/0xe0 kernel/bpf/syscall.c:327 queue_stack_map_alloc+0x14e/0x2f0 kernel/bpf/queue_stack_maps.c:81 find_and_alloc_map kernel/bpf/syscall.c:125 [inline] map_create+0x441/0x2190 kernel/bpf/syscall.c:842 __do_sys_bpf kernel/bpf/syscall.c:4417 [inline] __se_sys_bpf+0x203/0x680 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 388: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc0/0x270 mm/slub.c:4191 kvfree+0x35/0x40 mm/util.c:647 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:337 queue_stack_map_free+0x15/0x20 kernel/bpf/queue_stack_maps.c:104 bpf_map_free_deferred+0xaf/0x110 kernel/bpf/syscall.c:486 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x52/0x310 kernel/workqueue.c:1352 __queue_work+0x923/0xca0 kernel/workqueue.c:1518 queue_work_on+0xd5/0x130 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:515 [inline] schedule_work include/linux/workqueue.h:576 [inline] __bpf_map_put kernel/bpf/syscall.c:508 [inline] bpf_map_put+0x1cf/0x240 kernel/bpf/syscall.c:514 bpf_map_put_with_uref kernel/bpf/syscall.c:521 [inline] bpf_map_release+0x118/0x130 kernel/bpf/syscall.c:531 __fput+0x2fb/0x770 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa27/0x2470 kernel/exit.c:863 do_group_exit+0x141/0x310 kernel/exit.c:985 get_signal+0xf7d/0x12e0 kernel/signal.c:2793 arch_do_signal_or_restart+0xbf/0x10f0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888101796000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1120 bytes inside of 2048-byte region [ffff888101796000, ffff888101796800) The buggy address belongs to the page: page:ffffea000405e400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101790 head:ffffea000405e400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042d80 raw: 0000000000000000 0000000000080008 00000001ffffffff 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 1, ts 1879196837, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc_trace+0x1b3/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ds_create_walk_state+0xd6/0x270 drivers/acpi/acpica/dswstate.c:518 acpi_ps_execute_method+0x282/0x900 drivers/acpi/acpica/psxface.c:134 acpi_ns_evaluate+0x629/0xa00 drivers/acpi/acpica/nseval.c:205 acpi_evaluate_object+0x53c/0xa00 drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0xf5/0x1c0 drivers/acpi/utils.c:279 acpi_bus_get_status_handle drivers/acpi/bus.c:83 [inline] acpi_bus_get_status+0x165/0x1f0 drivers/acpi/bus.c:112 acpi_serdev_check_resources drivers/tty/serdev/core.c:647 [inline] acpi_serdev_add_device+0x1a2/0x700 drivers/tty/serdev/core.c:722 acpi_ns_walk_namespace+0x23e/0x680 drivers/acpi/acpica/nswalk.c:-1 acpi_walk_namespace+0xf6/0x140 drivers/acpi/acpica/nsxfeval.c:606 page_owner free stack trace missing Memory state around the buggy address: ffff888101796300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888101796380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888101796400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888101796480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888101796500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================