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BUG: KASAN: use-after-free in hci_send_acl+0x41/0x980 net/bluetooth/hci_core.c:3991
Read of size 8 at addr ffff888093265318 by task kworker/u5:0/1529

CPU: 0 PID: 1529 Comm: kworker/u5:0 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 hci_send_acl+0x41/0x980 net/bluetooth/hci_core.c:3991
 l2cap_bredr_sig_cmd+0x2558/0xa5a0 net/bluetooth/l2cap_core.c:5230
 l2cap_sig_channel net/bluetooth/l2cap_core.c:6418 [inline]
 l2cap_recv_frame+0x858/0x8f10 net/bluetooth/l2cap_core.c:7660
 hci_acldata_packet net/bluetooth/hci_core.c:4520 [inline]
 hci_rx_work+0x7d7/0x9c0 net/bluetooth/hci_core.c:4710
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 1529:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 hci_chan_create+0x9a/0x270 net/bluetooth/hci_conn.c:1692
 l2cap_conn_add+0x66/0xb00 net/bluetooth/l2cap_core.c:7699
 l2cap_connect_cfm+0xdb/0x12b0 net/bluetooth/l2cap_core.c:8097
 hci_connect_cfm include/net/bluetooth/hci_core.h:1340 [inline]
 hci_remote_features_evt net/bluetooth/hci_event.c:3210 [inline]
 hci_event_packet+0x1164c/0x18260 net/bluetooth/hci_event.c:6061
 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Freed by task 1529:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 hci_disconn_loglink_complete_evt net/bluetooth/hci_event.c:4999 [inline]
 hci_event_packet+0x304e/0x18260 net/bluetooth/hci_event.c:6188
 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff888093265300
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 128-byte region [ffff888093265300, ffff888093265380)
The buggy address belongs to the page:
page:ffffea00024c9940 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888093265d00
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00028b4a08 ffffea00024c9408 ffff8880aa400700
raw: ffff888093265d00 ffff888093265000 0000000100000009 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888093265200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888093265280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888093265300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888093265380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888093265400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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