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Date: Wed, 16 Nov 2022 21:11:02 +0800 (GMT+08:00)
From: "Lin Ma" <linma@....edu.cn>
To: syzbot <syzbot+4adf5ff0f6e6876c6a81@...kaller.appspotmail.com>
Cc: davem@...emloft.net, edumazet@...gle.com,
krzysztof.kozlowski@...aro.org, kuba@...nel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference
in nci_send_cmd
> From: syzbot <syzbot+4adf5ff0f6e6876c6a81@...kaller.appspotmail.com>
> Sent Time: 2022-11-16 18:52:37 (Wednesday)
> To: davem@...emloft.net, edumazet@...gle.com, krzysztof.kozlowski@...aro.org, kuba@...nel.org, linma@....edu.cn, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
> Cc:
> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in nci_send_cmd
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 81e7cfa3a9eb Merge tag 'erofs-for-6.1-rc6-fixes' of git://..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13b7800d880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a2318f9a4fc31ad
> dashboard link: https://syzkaller.appspot.com/bug?extid=4adf5ff0f6e6876c6a81
> 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=11f435be880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1134d295880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/54f7533927a5/disk-81e7cfa3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f3861072b476/vmlinux-81e7cfa3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/c36747ab66fe/bzImage-81e7cfa3.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4adf5ff0f6e6876c6a81@...kaller.appspotmail.com
>
> 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: 3636 Comm: syz-executor551 Not tainted 6.1.0-rc5-syzkaller-00015-g81e7cfa3a9eb #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:__queue_work+0x1f6/0x13b0 kernel/workqueue.c:1459
> Code: ff ff 48 89 c3 e8 2a 6b 2e 00 4c 89 e7 e8 f2 59 ff ff 48 85 c0 49 89 c5 0f 84 57 01 00 00 e8 11 6b 2e 00 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 4a 10 00 00 4c 39 2b 0f 84 51 01 00 00 e8 f2 6a
> RSP: 0018:ffffc90003dff388 EFLAGS: 00010056
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: ffff888020e2ba80 RSI: ffffffff8151ae6f RDI: 0000000000000001
> RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff888020a890f8
> R13: ffff888012069800 R14: ffff888021d5d800 R15: ffff888021d5d800
> FS: 00007f11539a4700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1153a55390 CR3: 0000000077b28000 CR4: 0000000000350ef0
> Call Trace:
> <TASK>
> queue_work_on+0xf2/0x110 kernel/workqueue.c:1545
> queue_work include/linux/workqueue.h:503 [inline]
> nci_send_cmd+0x247/0x340 net/nfc/nci/core.c:1376
> nci_reset_req+0x76/0xa0 net/nfc/nci/core.c:166
> __nci_request+0x87/0x280 net/nfc/nci/core.c:107
> nci_open_device net/nfc/nci/core.c:502 [inline]
> nci_dev_up+0x2af/0x670 net/nfc/nci/core.c:631
> nfc_dev_up+0x1aa/0x3b0 net/nfc/core.c:118
> nfc_genl_dev_up+0xa6/0xf0 net/nfc/netlink.c:770
> genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:756
> genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
> genl_rcv_msg+0x445/0x780 net/netlink/genetlink.c:850
> netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
> genl_rcv+0x28/0x40 net/netlink/genetlink.c:861
> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
> netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
> netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
> sock_sendmsg_nosec net/socket.c:714 [inline]
> sock_sendmsg+0xd3/0x120 net/socket.c:734
> ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
> ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
> __sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f1153a142f9
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f11539a4318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00007f1153a9d438 RCX: 00007f1153a142f9
> RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004
> RBP: 00007f1153a9d430 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000008 R11: 0000000000000246 R12: 00007f1153a6a134
> R13: 00007ffc4c3309cf R14: 00007f11539a4400 R15: 0000000000022000
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:__queue_work+0x1f6/0x13b0 kernel/workqueue.c:1459
> Code: ff ff 48 89 c3 e8 2a 6b 2e 00 4c 89 e7 e8 f2 59 ff ff 48 85 c0 49 89 c5 0f 84 57 01 00 00 e8 11 6b 2e 00 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 4a 10 00 00 4c 39 2b 0f 84 51 01 00 00 e8 f2 6a
> RSP: 0018:ffffc90003dff388 EFLAGS: 00010056
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: ffff888020e2ba80 RSI: ffffffff8151ae6f RDI: 0000000000000001
> RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff888020a890f8
> R13: ffff888012069800 R14: ffff888021d5d800 R15: ffff888021d5d800
> FS: 00007f11539a4700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1153a55390 CR3: 0000000077b28000 CR4: 0000000000350ef0
> ----------------
> Code disassembly (best guess), 1 bytes skipped:
> 0: ff 48 89 decl -0x77(%rax)
> 3: c3 retq
> 4: e8 2a 6b 2e 00 callq 0x2e6b33
> 9: 4c 89 e7 mov %r12,%rdi
> c: e8 f2 59 ff ff callq 0xffff5a03
> 11: 48 85 c0 test %rax,%rax
> 14: 49 89 c5 mov %rax,%r13
> 17: 0f 84 57 01 00 00 je 0x174
> 1d: e8 11 6b 2e 00 callq 0x2e6b33
> 22: 48 89 d8 mov %rbx,%rax
> 25: 48 c1 e8 03 shr $0x3,%rax
> * 29: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
> 2d: 0f 85 4a 10 00 00 jne 0x107d
> 33: 4c 39 2b cmp %r13,(%rbx)
> 36: 0f 84 51 01 00 00 je 0x18d
> 3c: e8 .byte 0xe8
> 3d: f2 repnz
> 3e: 6a .byte 0x6a
>
>
> ---
> 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.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
#syz test: https://github.com/f0rm2l1n/linux-fix.git master
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