syzbot

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BUG: KASAN: slab-use-after-free in hci_conn_hash_flush+0x23c/0x260 net/bluetooth/hci_conn.c:2437
Read of size 8 at addr ffff888090964000 by task syz-executor.0/16787

CPU: 0 PID: 16787 Comm: syz-executor.0 Not tainted 6.3.0-rc3-next-20230324-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 hci_conn_hash_flush+0x23c/0x260 net/bluetooth/hci_conn.c:2437
 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4893
 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554
 hci_rfkill_set_block+0x161/0x1d0 net/bluetooth/hci_core.c:956
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:345
 rfkill_fop_write+0x2c7/0x570 net/rfkill/core.c:1286
 vfs_write+0x2e4/0xe20 fs/read_write.c:582
 ksys_write+0x1ec/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7efcd288c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efcd3553168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efcd29ac050 RCX: 00007efcd288c0f9
RDX: 0000000000000008 RSI: 0000000020000fc0 RDI: 000000000000000c
RBP: 00007efcd28e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc985cd19f R14: 00007efcd3553300 R15: 0000000000022000
 </TASK>

Allocated by task 32672:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 ____kasan_kmalloc mm/kasan/common.c:333 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 hci_conn_add+0xb8/0x15c0 net/bluetooth/hci_conn.c:962
 hci_connect_sco+0x42c/0xac0 net/bluetooth/hci_conn.c:1607
 sco_connect net/bluetooth/sco.c:255 [inline]
 sco_sock_connect+0x350/0xa60 net/bluetooth/sco.c:598
 __sys_connect_file+0x153/0x1a0 net/socket.c:2001
 __sys_connect+0x165/0x1a0 net/socket.c:2018
 __do_sys_connect net/socket.c:2028 [inline]
 __se_sys_connect net/socket.c:2025 [inline]
 __x64_sys_connect+0x73/0xb0 net/socket.c:2025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 16787:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800
 device_release+0xa3/0x240 drivers/base/core.c:2477
 kobject_cleanup lib/kobject.c:683 [inline]
 kobject_release lib/kobject.c:714 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c2/0x4d0 lib/kobject.c:731
 put_device+0x1f/0x30 drivers/base/core.c:3719
 hci_conn_del+0x212/0xa70 net/bluetooth/hci_conn.c:1112
 hci_conn_del+0x7df/0xa70 net/bluetooth/hci_conn.c:1071
 hci_conn_hash_flush+0x19b/0x260 net/bluetooth/hci_conn.c:2441
 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4893
 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554
 hci_rfkill_set_block+0x161/0x1d0 net/bluetooth/hci_core.c:956
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:345
 rfkill_fop_write+0x2c7/0x570 net/rfkill/core.c:1286
 vfs_write+0x2e4/0xe20 fs/read_write.c:582
 ksys_write+0x1ec/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
 insert_work+0x48/0x360 kernel/workqueue.c:1365
 __queue_work+0x5c6/0xfb0 kernel/workqueue.c:1526
 __queue_delayed_work+0x1c8/0x270 kernel/workqueue.c:1674
 queue_delayed_work_on+0x109/0x120 kernel/workqueue.c:1710
 queue_delayed_work include/linux/workqueue.h:520 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1417 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1387 [inline]
 sco_chan_del+0x1f8/0x4f0 net/bluetooth/sco.c:169
 __sco_sock_close+0x178/0x740 net/bluetooth/sco.c:431
 sco_sock_close net/bluetooth/sco.c:446 [inline]
 sco_sock_release+0x81/0x360 net/bluetooth/sco.c:1254
 __sock_release+0xcd/0x290 net/socket.c:653
 sock_close+0x1c/0x20 net/socket.c:1395
 __fput+0x27c/0xa90 fs/file_table.c:321
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 get_signal+0x1c7/0x25b0 kernel/signal.c:2635
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:307
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888090964000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes inside of
 freed 4096-byte region [ffff888090964000, ffff888090965000)

The buggy address belongs to the physical page:
page:ffffea0002425800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x90960
head:ffffea0002425800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff888012442140 ffffea0000dbf600 dead000000000002
raw: 0000000000000000 0000000000040004 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 29683, tgid 29681 (syz-executor.5), ts 1420479975146, free_ts 1420360267929
 prep_new_page mm/page_alloc.c:1729 [inline]
 get_page_from_freelist+0xf75/0x2aa0 mm/page_alloc.c:3493
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x28e/0x380 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:579 [inline]
 kvmalloc_node+0xa2/0x1a0 mm/util.c:604
 kvmalloc include/linux/slab.h:697 [inline]
 kvzalloc include/linux/slab.h:705 [inline]
 bucket_table_alloc.isra.0+0x8c/0x480 lib/rhashtable.c:184
 rhashtable_init+0x38b/0x7e0 lib/rhashtable.c:1065
 tipc_init_net+0x30c/0x440 net/tipc/core.c:76
 ops_init+0xb9/0x6b0 net/core/net_namespace.c:136
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:339
 copy_net_ns+0x4ee/0x8e0 net/core/net_namespace.c:491
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1302 [inline]
 free_unref_page_prepare+0x4d8/0xb80 mm/page_alloc.c:2555
 free_unref_page+0x33/0x370 mm/page_alloc.c:2650
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:711 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 __kmem_cache_alloc_node+0x17c/0x320 mm/slub.c:3491
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 io_get_sq_data io_uring/sqpoll.c:149 [inline]
 io_sq_offload_create+0x329/0x10e0 io_uring/sqpoll.c:359
 io_uring_create io_uring/io_uring.c:3823 [inline]
 io_uring_setup+0x13d2/0x22d0 io_uring/io_uring.c:3917
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888090963f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888090963f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888090964000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888090964080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888090964100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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