==================================================================
BUG: KASAN: use-after-free in hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1494
Read of size 8 at addr ffff88801d43c998 by task kworker/u5:2/3651

CPU: 1 PID: 3651 Comm: kworker/u5:2 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: hci7 hci_cmd_timeout
Call Trace:
 <TASK>
 __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:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1494
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Allocated by task 3656:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7e/0x80 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3336 [inline]
 slab_alloc mm/slub.c:3344 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3351 [inline]
 kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3360
 skb_clone+0x16e/0x3c0 net/core/skbuff.c:1548
 hci_cmd_work+0x191/0x570 net/bluetooth/hci_core.c:4064
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Freed by task 3662:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____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:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 kmem_cache_free+0xea/0x5b0 mm/slub.c:3621
 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:714
 __kfree_skb net/core/skbuff.c:771 [inline]
 kfree_skb_reason+0x193/0x4b0 net/core/skbuff.c:793
 kfree_skb include/linux/skbuff.h:1207 [inline]
 hci_dev_open_sync+0xbe2/0x2190 net/bluetooth/hci_sync.c:4698
 hci_dev_do_open+0x2d/0x70 net/bluetooth/hci_core.c:483
 hci_power_on+0xda/0x620 net/bluetooth/hci_core.c:984
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

The buggy address belongs to the object at ffff88801d43c8c0
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 216 bytes inside of
 240-byte region [ffff88801d43c8c0, ffff88801d43c9b0)

The buggy address belongs to the physical page:
page:ffffea0000750f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xdead000000000100 pfn:0x1d43c
memcg:ffff88807ca7f481
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff888012734500 dead0000000c000c 0000000000000000
raw: dead000000000100 dead000000000122 00000001ffffffff ffff88807ca7f481
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3607, tgid 3600 (syz-fuzzer), ts 73274010740, free_ts 73239819320
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 kmem_cache_alloc_node+0x18b/0x400 mm/slub.c:3381
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:422
 alloc_skb include/linux/skbuff.h:1258 [inline]
 __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3955
 __tcp_send_ack net/ipv4/tcp_output.c:3987 [inline]
 tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3987
 __tcp_cleanup_rbuf+0x356/0x470 net/ipv4/tcp.c:1617
 tcp_recvmsg_locked+0x72c/0x22c0 net/ipv4/tcp.c:2649
 tcp_recvmsg+0x113/0x620 net/ipv4/tcp.c:2679
 inet_recvmsg+0x110/0x5d0 net/ipv4/af_inet.c:850
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 sock_recvmsg net/socket.c:1009 [inline]
 sock_read_iter+0x344/0x470 net/socket.c:1086
 call_read_iter include/linux/fs.h:2184 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x7f6/0x930 fs/read_write.c:470
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1458 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2532
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3336 [inline]
 kmem_cache_alloc_node+0x2ff/0x400 mm/slub.c:3381
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:422
 alloc_skb_fclone include/linux/skbuff.h:1308 [inline]
 tcp_stream_alloc_skb+0x38/0x580 net/ipv4/tcp.c:861
 tcp_sendmsg_locked+0xc36/0x2f90 net/ipv4/tcp.c:1325
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1483
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 sock_write_iter+0x291/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2190 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:578
 ksys_write+0x1e8/0x250 fs/read_write.c:631

Memory state around the buggy address:
 ffff88801d43c880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff88801d43c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801d43c980: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff88801d43ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801d43ca80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
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