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Date: Wed, 18 May 2022 23:32:42 -0700
From: syzbot <syzbot+e3cad3a4e3f03bc00562@...kaller.appspotmail.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: davem@...emloft.net, dvyukov@...gle.com, 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, poprdi@...gle.com,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] general protection fault in hci_inquiry_result_with_rssi_evt
> On Mon, 13 Dec 2021 at 08:17, syzbot
> <syzbot+e3cad3a4e3f03bc00562@...kaller.appspotmail.com> wrote:
>>
>> 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")
>
> Presumably this was fixed by Luiz's patch:
> https://github.com/torvalds/linux/commit/72279d17df54d5e4e7910b39c61a3f3464e36633
>
> Let's close on syzbot to get new reports in future:
>
> #syz fix: Bluetooth: hci_event: Rework hci_inquiry_result_with_rssi_evt
I see the command but can't find the corresponding bug.
The email is sent to syzbot+HASH@...kaller.appspotmail.com address
but the HASH does not correspond to any known bug.
Please double check the address.
>
>
>> 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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