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BUG: KASAN: use-after-free in hci_cmd_timeout+0x1f1/0x210 net/bluetooth/hci_core.c:1473
Read of size 8 at addr ffff88806d971990 by task kworker/1:8/3765

CPU: 1 PID: 3765 Comm: kworker/1:8 Not tainted 5.16.0-rc4-next-20211210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events 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.constprop.0.cold+0xa5/0x3ed mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 hci_cmd_timeout+0x1f1/0x210 net/bluetooth/hci_core.c:1473
 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307
 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 3882:
 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:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:766 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 slab_alloc mm/slub.c:3239 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3244
 skb_clone+0x170/0x3c0 net/core/skbuff.c:1517
 hci_cmd_work+0x18c/0x3c0 net/bluetooth/hci_core.c:3853
 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307
 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Freed by task 3712:
 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:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3510 [inline]
 kmem_cache_free+0xdd/0x580 mm/slub.c:3527
 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:700
 __kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb net/core/skbuff.c:774 [inline]
 kfree_skb+0x140/0x3f0 net/core/skbuff.c:768
 hci_dev_open_sync+0x9e2/0x20c0 net/bluetooth/hci_sync.c:3984
 hci_dev_do_open+0x32/0x70 net/bluetooth/hci_core.c:482
 hci_power_on+0x133/0x640 net/bluetooth/hci_core.c:963
 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307
 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88806d9718c0
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 208 bytes inside of
 232-byte region [ffff88806d9718c0, ffff88806d9719a8)
The buggy address belongs to the page:
page:ffffea0001b65c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6d971
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0001bb2180 dead000000000005 ffff8881447ee000
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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3757, ts 1697968212183, free_ts 1697185560021
 prep_new_page mm/page_alloc.c:2433 [inline]
 get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4164
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5376
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x28d/0x3a0 mm/slub.c:2004
 ___slab_alloc+0x6be/0xd60 mm/slub.c:3019
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3106
 slab_alloc_node mm/slub.c:3197 [inline]
 kmem_cache_alloc_node+0x122/0x3e0 mm/slub.c:3267
 __alloc_skb+0x215/0x340 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1129 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:745 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline]
 nsim_dev_trap_report_work+0x29a/0xbc0 drivers/net/netdevsim/dev.c:843
 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307
 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1351 [inline]
 free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1403
 free_unref_page_prepare mm/page_alloc.c:3324 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3403
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2537
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0x100 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:766 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 slab_alloc mm/slub.c:3239 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3244
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags include/linux/audit.h:323 [inline]
 getname+0x8e/0xd0 fs/namei.c:217
 do_sys_openat2+0xf5/0x4d0 fs/open.c:1208
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241
 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+0x44/0xae

Memory state around the buggy address:
 ffff88806d971880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff88806d971900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806d971980: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff88806d971a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806d971a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
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