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BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26
Read of size 8 at addr ffff88802a39c4c8 by task kworker/u5:5/8862

CPU: 1 PID: 8862 Comm: kworker/u5:5 Not tainted 5.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci5 hci_rx_work

Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x93/0xc2 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
 __list_add_valid+0x93/0xa0 lib/list_debug.c:26
 __list_add include/linux/list.h:67 [inline]
 list_add_tail include/linux/list.h:100 [inline]
 add_tail lib/klist.c:104 [inline]
 klist_add_tail+0x5c/0x120 lib/klist.c:137
 device_add+0xb1a/0x1ad0 drivers/base/core.c:3250
 hci_conn_add_sysfs+0x88/0x150 net/bluetooth/hci_sysfs.c:53
 hci_sync_conn_complete_evt.isra.0+0x4a2/0x730 net/bluetooth/hci_event.c:4356
 hci_event_packet+0xcda/0x71b0 net/bluetooth/hci_event.c:6243
 hci_rx_work+0x3db/0xba0 net/bluetooth/hci_core.c:5088
 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 8862:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 ____kasan_kmalloc mm/kasan/common.c:506 [inline]
 __kasan_kmalloc+0x7a/0x90 mm/kasan/common.c:515
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:684 [inline]
 device_private_init drivers/base/core.c:3084 [inline]
 device_add+0xc80/0x1ad0 drivers/base/core.c:3134
 hci_conn_add_sysfs+0x88/0x150 net/bluetooth/hci_sysfs.c:53
 hci_conn_complete_evt net/bluetooth/hci_event.c:2643 [inline]
 hci_event_packet+0x92c/0x71b0 net/bluetooth/hci_event.c:6153
 hci_rx_work+0x3db/0xba0 net/bluetooth/hci_core.c:5088
 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 8844:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xda/0x110 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x51/0x130 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xdb/0x3c0 mm/slub.c:4213
 device_add+0x3c0/0x1ad0 drivers/base/core.c:3288
 hci_conn_add_sysfs+0x88/0x150 net/bluetooth/hci_sysfs.c:53
 hci_sync_conn_complete_evt.isra.0+0x4a2/0x730 net/bluetooth/hci_event.c:4356
 hci_event_packet+0xcda/0x71b0 net/bluetooth/hci_event.c:6243
 hci_rx_work+0x3db/0xba0 net/bluetooth/hci_core.c:5088
 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff88802a39c400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 200 bytes inside of
 512-byte region [ffff88802a39c400, ffff88802a39c600)
The buggy address belongs to the page:
page:00000000fb3d3144 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a39c
head:00000000fb3d3144 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88800f041c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88802a39c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802a39c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802a39c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88802a39c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802a39c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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