Date:   Sun, 12 Dec 2021 23:17:25 -0800
From:   syzbot <syzbot+e3cad3a4e3f03bc00562@...kaller.appspotmail.com>
To:     davem@...emloft.net, johan.hedberg@...il.com, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        luiz.dentz@...il.com, luiz.von.dentz@...el.com,
        marcel@...tmann.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in hci_inquiry_result_with_rssi_evt

Hello,

syzbot found the following issue on:

HEAD commit:    4eee8d0b64ec Add linux-next specific files for 20211208
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=130203e5b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=20b74d9da4ce1ef1
dashboard link: https://syzkaller.appspot.com/bug?extid=e3cad3a4e3f03bc00562
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101eb355b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15b8f805b00000

The issue was bisected to:

commit 3e54c5890c87a30b1019a3de9dab968ff2b21e06
Author: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Date:   Wed Dec 1 18:55:03 2021 +0000

    Bluetooth: hci_event: Use of a function table to handle HCI events

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=150100bab00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=170100bab00000
console output: https://syzkaller.appspot.com/x/log.txt?x=130100bab00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e3cad3a4e3f03bc00562@...kaller.appspotmail.com
Fixes: 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events")

Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 6545 Comm: kworker/u5:1 Not tainted 5.16.0-rc4-next-20211208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
RIP: 0010:hci_inquiry_result_with_rssi_evt+0xbc/0x970 net/bluetooth/hci_event.c:4520
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 88 07 00 00 48 8b 04 24 4c 8b 28 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 1b 07 00 00
RSP: 0018:ffffc90001aafad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807e754000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff883588a8 RDI: ffff88807e754000
RBP: ffff88807e754000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88376f27 R11: 0000000000000000 R12: ffff88807015eb40
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd653f7000 CR3: 0000000071f88000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hci_event_func net/bluetooth/hci_event.c:6812 [inline]
 hci_event_packet+0x817/0xe90 net/bluetooth/hci_event.c:6860
 hci_rx_work+0x4fa/0xd30 net/bluetooth/hci_core.c:3817
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 403a15c54e29c5c4 ]---
RIP: 0010:hci_inquiry_result_with_rssi_evt+0xbc/0x970 net/bluetooth/hci_event.c:4520
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 88 07 00 00 48 8b 04 24 4c 8b 28 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 1b 07 00 00
RSP: 0018:ffffc90001aafad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807e754000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff883588a8 RDI: ffff88807e754000
RBP: ffff88807e754000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88376f27 R11: 0000000000000000 R12: ffff88807015eb40
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb803f018 CR3: 000000001d893000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 88 07 00 00    	jne    0x796
   e:	48 8b 04 24          	mov    (%rsp),%rax
  12:	4c 8b 28             	mov    (%rax),%r13
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	4c 89 ea             	mov    %r13,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
* 26:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2a:	4c 89 ea             	mov    %r13,%rdx
  2d:	83 e2 07             	and    $0x7,%edx
  30:	38 d0                	cmp    %dl,%al
  32:	7f 08                	jg     0x3c
  34:	84 c0                	test   %al,%al
  36:	0f 85 1b 07 00 00    	jne    0x757


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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