netdev - drivers/net/hamradio: divide error in hdlcdrv

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Message-ID: <CAAeHK+ya2sAtLmJ0VyP6e=13OXUw98dp1WdRFU=o5+xGFGPtbQ@mail.gmail.com>
Date:   Tue, 16 May 2017 17:05:32 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Alan Cox <alan@...ux.intel.com>,
        Thomas Osterried <thomas@...erried.de>,
        Javier Martinez Canillas <javier@....samsung.com>,
        David Howells <dhowells@...hat.com>,
        Geliang Tang <geliangtang@...il.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: drivers/net/hamradio: divide error in hdlcdrv_ioctl

Hi,

I've got the following error report while fuzzing the kernel with syzkaller.

On commit 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (4.12-rc1).

A reproducer and .config are attached.

divide error: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 1 PID: 4019 Comm: a.out Not tainted 4.12.0-rc1+ #363
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88006b97c200 task.stack: ffff880062098000
RIP: 0010:hdlcdrv_ioctl+0x8a3/0x1a50 drivers/net/hamradio/hdlcdrv.c:579
RSP: 0018:ffff88006209f898 EFLAGS: 00010246
RAX: 000000007fffffff RBX: ffff88006209f8d0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88006888abd0
RBP: ffff88006209f9b8 R08: 1ffff1000c413e8a R09: 1ffff1000c413e6a
R10: ffff88006b97c200 R11: 0000000000000001 R12: 1ffff1000c413f16
R13: ffff88006888a100 R14: 0000000000000000 R15: 00000000005b78f4
FS:  00007fb533884700(0000) GS:ffff88006cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002026b000 CR3: 0000000065576000 CR4: 00000000000006e0
Call Trace:
 dev_ifsioc+0x53f/0x9f0 net/core/dev_ioctl.c:338
 dev_ioctl+0xc3c/0x1160 net/core/dev_ioctl.c:555
 sock_ioctl+0x169/0x440 net/socket.c:944
 vfs_ioctl fs/ioctl.c:45
 do_vfs_ioctl+0x1bf/0x1660 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe arch/x86/entry/entry_64.S:204
RIP: 0033:0x7fb532f96b79
RSP: 002b:00007fffac2839f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fffac283b60 RCX: 00007fb532f96b79
RDX: 00000000208f1fd8 RSI: 00000100000089f0 RDI: 0000000000000003
RBP: 00000000004004e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fffac283b60 R14: 0000000000000000 R15: 0000000000000000
Code: 45 8b be 48 ff ff ff 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74
08 3c 03 0f 8e 8b 0e 00 00 45 8b b5 d0 0a 00 00 b8 ff ff ff 7f 99 <41>
f7 fe 41 39 c7 0f 87 89 0c 00 00 e8 ac e5 7e fe 49 8d bd d8
RIP: hdlcdrv_ioctl+0x8a3/0x1a50 RSP: ffff88006209f898
---[ end trace 204af21e5cc80963 ]---
qemu: terminating on signal 15 from pid 141905

View attachment "hdlcdrv-divide-poc.c" of type "text/x-csrc" (2267 bytes)

Download attachment ".config" of type "application/octet-stream" (129113 bytes)