==================================================================
BUG: KASAN: use-after-free in hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1485
Read of size 8 at addr ffff888071e9c498 by task kworker/0:2/145

CPU: 0 PID: 145 Comm: kworker/0:2 Not tainted 6.0.0-rc4-syzkaller-00673-gce888220d5c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: events hci_cmd_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 hci_cmd_timeout+0x6a/0x1f0 net/bluetooth/hci_core.c:1485
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>

Allocated by task 3732:
 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:437 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3268
 skb_clone+0x1e0/0x360 net/core/skbuff.c:1547
 hci_cmd_work+0xba/0x3c0 net/bluetooth/hci_core.c:4048
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

Freed by task 48:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1754 [inline]
 slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780
 slab_free mm/slub.c:3534 [inline]
 kmem_cache_free+0x95/0x1d0 mm/slub.c:3551
 kfree_skb include/linux/skbuff.h:1206 [inline]
 hci_dev_open_sync+0x622/0x8d0 net/bluetooth/hci_sync.c:4377
 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline]
 hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:975
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

The buggy address belongs to the object at ffff888071e9c3c0
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 216 bytes inside of
 240-byte region [ffff888071e9c3c0, ffff888071e9c4b0)

The buggy address belongs to the physical page:
page:ffffea0001c7a700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x71e9c
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000635dc0 dead000000000004 ffff888140a34000
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3910, tgid 3907 (syz-executor.2), ts 91800165831, free_ts 91797155645
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515
 alloc_slab_page+0x70/0xf0 mm/slub.c:1824
 allocate_slab+0x5e/0x520 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x42e/0xce0 mm/slub.c:3031
 __slab_alloc mm/slub.c:3118 [inline]
 slab_alloc_node mm/slub.c:3209 [inline]
 kmem_cache_alloc_node+0x28a/0x350 mm/slub.c:3293
 __alloc_skb+0xd5/0x620 net/core/skbuff.c:422
 alloc_skb include/linux/skbuff.h:1257 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline]
 hci_si_event net/bluetooth/hci_sock.c:726 [inline]
 hci_sock_dev_event+0xf2/0x5b0 net/bluetooth/hci_sock.c:768
 hci_register_dev+0x6a5/0xa30 net/bluetooth/hci_core.c:2638
 hci_uart_register_dev+0x492/0x5e0 drivers/bluetooth/hci_ldisc.c:685
 hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:709 [inline]
 hci_uart_tty_ioctl+0x362/0x430 drivers/bluetooth/hci_ldisc.c:762
 tty_ioctl+0x909/0xc60 drivers/tty/tty_io.c:2787
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 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+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 __vunmap+0x867/0x9d0 mm/vmalloc.c:2696
 n_tty_close+0x162/0x1d0 drivers/tty/n_tty.c:1861
 tty_set_ldisc+0x22f/0x670 drivers/tty/tty_ldisc.c:552
 tty_ioctl+0xada/0xc60 drivers/tty/tty_io.c:2714
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888071e9c380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888071e9c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888071e9c480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888071e9c500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888071e9c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
==================================================================