================================================================== BUG: KASAN: use-after-free in notifier_chain_register+0x1bd/0x210 kernel/notifier.c:32 Read of size 4 at addr ffff88805f211118 by task syz-executor.5/4340 CPU: 1 PID: 4340 Comm: syz-executor.5 Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 notifier_chain_register+0x1bd/0x210 kernel/notifier.c:32 __blocking_notifier_chain_register kernel/notifier.c:266 [inline] blocking_notifier_chain_register+0x6f/0xc0 kernel/notifier.c:284 hci_register_suspend_notifier net/bluetooth/hci_core.c:2749 [inline] hci_register_suspend_notifier+0x9d/0xc0 net/bluetooth/hci_core.c:2743 hci_register_dev+0x62c/0xbb0 net/bluetooth/hci_core.c:2641 __vhci_create_device+0x393/0x7d0 drivers/bluetooth/hci_vhci.c:336 vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:431 [inline] vhci_write+0x2b5/0x460 drivers/bluetooth/hci_vhci.c:511 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4642f9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb005b0e198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004642f9 RDX: 0000000000000002 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 0000000000526e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007fb005b0e6bc R14: 00000000ffffffff R15: 0000000000000003 Allocated by task 4338: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] __do_kmalloc mm/slab.c:3686 [inline] __kmalloc+0x1f9/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] hci_alloc_dev_priv+0x1e/0x2570 net/bluetooth/hci_core.c:2418 hci_alloc_dev include/net/bluetooth/hci_core.h:1460 [inline] __vhci_create_device+0xf9/0x7d0 drivers/bluetooth/hci_vhci.c:304 vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:431 [inline] vhci_write+0x2b5/0x460 drivers/bluetooth/hci_vhci.c:511 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4332: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x13d/0x1a0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3418 [inline] kfree+0x173/0x390 mm/slab.c:3786 hci_release_dev+0x4cf/0x600 net/bluetooth/hci_core.c:2739 bt_host_release+0x66/0xa0 net/bluetooth/hci_sysfs.c:88 device_release+0x9f/0x240 drivers/base/core.c:2330 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1be/0x4c0 lib/kobject.c:721 put_device+0x1b/0x30 drivers/base/core.c:3624 vhci_release+0x84/0xf0 drivers/bluetooth/hci_vhci.c:569 __fput+0x277/0x9d0 fs/file_table.c:320 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x625/0x1210 kernel/workqueue.c:1517 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] hci_register_dev+0x679/0xbb0 net/bluetooth/hci_core.c:2645 __vhci_create_device+0x393/0x7d0 drivers/bluetooth/hci_vhci.c:336 vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:431 [inline] vhci_write+0x2b5/0x460 drivers/bluetooth/hci_vhci.c:511 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88805f210000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4376 bytes inside of 8192-byte region [ffff88805f210000, ffff88805f212000) The buggy address belongs to the physical page: page:ffffea00017c8400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f210 head:ffffea00017c8400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00017c6a08 ffffea00017c6b08 ffff888011840a00 raw: 0000000000000000 ffff88805f210000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 4338, tgid 4332 (syz-executor.2), ts 88151357783, free_ts 12947427886 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3246 [inline] slab_alloc mm/slab.c:3287 [inline] __do_kmalloc mm/slab.c:3684 [inline] __kmalloc+0x3a1/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] hci_alloc_dev_priv+0x1e/0x2570 net/bluetooth/hci_core.c:2418 hci_alloc_dev include/net/bluetooth/hci_core.h:1460 [inline] __vhci_create_device+0xf9/0x7d0 drivers/bluetooth/hci_vhci.c:304 vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:431 [inline] vhci_write+0x2b5/0x460 drivers/bluetooth/hci_vhci.c:511 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 free_contig_range+0xb1/0x180 mm/page_alloc.c:9453 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x2945/0x29d6 mm/debug_vm_pgtable.c:1354 do_one_initcall+0xfe/0x650 init/main.c:1296 do_initcall_level init/main.c:1369 [inline] do_initcalls init/main.c:1385 [inline] do_basic_setup init/main.c:1404 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1623 kernel_init+0x1a/0x1d0 init/main.c:1512 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88805f211000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f211080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f211100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f211180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f211200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================