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Date:   Sun, 19 Dec 2021 06:58:24 -0800
In-Reply-To: <00000000000062b41d05a2ea82b0@google.com>
Message-ID: <00000000000005721f05d3810165@google.com>
Subject: Re: [syzbot] kernel BUG at net/phonet/socket.c:LINE!
From:   syzbot <syzbot+2dc91e7fc3dea88b1e8a@syzkaller.appspotmail.com>
To:     courmisch@gmail.com, davem@davemloft.net, kuba@kernel.org,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

syzbot has found a reproducer for the following issue on:

HEAD commit:    60ec7fcfe768 qlcnic: potential dereference null pointer of..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=11b3505db00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa556098924b78f0
dashboard link: https://syzkaller.appspot.com/bug?extid=2dc91e7fc3dea88b1e8a
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=168791cdb00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14a0cbcdb00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2dc91e7fc3dea88b1e8a@syzkaller.appspotmail.com

netlink: 'syz-executor185': attribute type 2 has an invalid length.
------------[ cut here ]------------
kernel BUG at net/phonet/socket.c:213!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3620 Comm: syz-executor185 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline]
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline] net/phonet/socket.c:202
RIP: 0010:pn_socket_autobind+0x13c/0x160 net/phonet/socket.c:202 net/phonet/socket.c:202
Code: 44 05 00 00 00 00 00 48 8b 44 24 58 65 48 2b 04 25 28 00 00 00 75 26 48 83 c4 60 44 89 e0 5b 5d 41 5c 41 5d c3 e8 64 60 1e f9 <0f> 0b e8 2d 25 65 f9 eb 9f e8 46 25 65 f9 e9 6d ff ff ff e8 8c 2b
RSP: 0018:ffffc90001bafc40 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801c748000 RSI: ffffffff8859516c RDI: 0000000000000003
RBP: 1ffff92000375f88 R08: 00000000ffffffea R09: 0000000000000000
R10: ffffffff8859512c R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88801c748000
FS:  0000555556878300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000740 CR3: 0000000018a78000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pn_socket_connect+0xfc/0x970 net/phonet/socket.c:227 net/phonet/socket.c:227
 __sys_connect_file+0x155/0x1a0 net/socket.c:1896 net/socket.c:1896
 __sys_connect+0x161/0x190 net/socket.c:1913 net/socket.c:1913
 __do_sys_connect net/socket.c:1923 [inline]
 __se_sys_connect net/socket.c:1920 [inline]
 __do_sys_connect net/socket.c:1923 [inline] net/socket.c:1920
 __se_sys_connect net/socket.c:1920 [inline] net/socket.c:1920
 __x64_sys_connect+0x6f/0xb0 net/socket.c:1920 net/socket.c:1920
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9bf1080159
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff1adca428 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9bf1080159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000013355
R13: 00007fff1adca490 R14: 00007fff1adca480 R15: 00007fff1adca44c
 </TASK>
Modules linked in:
---[ end trace 16a4e3e11e1ba5b9 ]---
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline]
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline] net/phonet/socket.c:202
RIP: 0010:pn_socket_autobind+0x13c/0x160 net/phonet/socket.c:202 net/phonet/socket.c:202
Code: 44 05 00 00 00 00 00 48 8b 44 24 58 65 48 2b 04 25 28 00 00 00 75 26 48 83 c4 60 44 89 e0 5b 5d 41 5c 41 5d c3 e8 64 60 1e f9 <0f> 0b e8 2d 25 65 f9 eb 9f e8 46 25 65 f9 e9 6d ff ff ff e8 8c 2b
RSP: 0018:ffffc90001bafc40 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801c748000 RSI: ffffffff8859516c RDI: 0000000000000003
RBP: 1ffff92000375f88 R08: 00000000ffffffea R09: 0000000000000000
R10: ffffffff8859512c R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88801c748000
FS:  0000555556878300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000740 CR3: 0000000018a78000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400