Bluetooth: hci6: Entering manufacturer mode failed (-110)
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BUG: KASAN: use-after-free in hci_cmd_timeout+0x1ae/0x1c0 net/bluetooth/hci_core.c:2581
Read of size 2 at addr ffff8880a5483cc8 by task kworker/1:2/3686

CPU: 1 PID: 3686 Comm: kworker/1:2 Not tainted 4.19.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events hci_cmd_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 hci_cmd_timeout+0x1ae/0x1c0 net/bluetooth/hci_core.c:2581
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 8145:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 hci_prepare_cmd+0x2a/0x290 net/bluetooth/hci_request.c:296
 hci_req_add_ev+0xdc/0x220 net/bluetooth/hci_request.c:330
 __hci_cmd_sync_ev+0x119/0x670 net/bluetooth/hci_request.c:138
 btintel_enter_mfg+0x2a/0x90 drivers/bluetooth/btintel.c:82
 ag6xx_setup+0xfc/0x790 drivers/bluetooth/hci_ag6xx.c:180
 hci_uart_setup+0x1b1/0x470 drivers/bluetooth/hci_ldisc.c:431
 hci_dev_do_open+0x360/0x1260 net/bluetooth/hci_core.c:1425
 hci_power_on+0x117/0x530 net/bluetooth/hci_core.c:2137
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Freed by task 8145:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 skb_free_head net/core/skbuff.c:563 [inline]
 skb_release_data+0x6de/0x920 net/core/skbuff.c:583
 skb_release_all net/core/skbuff.c:640 [inline]
 __kfree_skb net/core/skbuff.c:654 [inline]
 kfree_skb+0x11a/0x3d0 net/core/skbuff.c:672
 hci_dev_do_open+0xaf0/0x1260 net/bluetooth/hci_core.c:1516
 hci_power_on+0x117/0x530 net/bluetooth/hci_core.c:2137
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the object at ffff8880a5483cc0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 512-byte region [ffff8880a5483cc0, ffff8880a5483ec0)
The buggy address belongs to the page:
page:ffffea00029520c0 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff8880a54832c0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002ac6908 ffffea00026b1008 ffff88813bff0940
raw: ffff8880a54832c0 ffff8880a5483040 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a5483b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8880a5483c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a5483c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                              ^
 ffff8880a5483d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a5483d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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