general protection fault in hci_phy_link_complete_evt

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    ac3a0c84 Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ab47ca900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c0cfcf935bcc94d2
dashboard link: https://syzkaller.appspot.com/bug?extid=18e38290a2a263b31aa0
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f3dd0c900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1032a642900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+18e38290a2a263b31aa0@xxxxxxxxxxxxxxxxxxxxxxxxx

general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 6861 Comm: kworker/u5:1 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
RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790 net/bluetooth/hci_event.c:4926
Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc90001897a38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff871af0e3
RDX: 0000000000000002 RSI: ffffffff871af0f0 RDI: 0000000000000010
RBP: ffff88808f25e000 R08: 0000000000000001 R09: ffff8880a1cf6a88
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880877f1110 R14: ffff8880926b480b R15: 00000000000000c8
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000a7ccc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 hci_event_packet+0x481a/0x86f5 net/bluetooth/hci_event.c:6180
 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Modules linked in:
---[ end trace 905ef6786a414f06 ]---
RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790 net/bluetooth/hci_event.c:4926
Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc90001897a38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff871af0e3
RDX: 0000000000000002 RSI: ffffffff871af0f0 RDI: 0000000000000010
RBP: ffff88808f25e000 R08: 0000000000000001 R09: ffff8880a1cf6a88
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880877f1110 R14: ffff8880926b480b R15: 00000000000000c8
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff77d3f7a7 CR3: 000000009291e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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