From: Oliver Neukum <oneukum@suse.com>
To: syzbot <syzbot+200d4bb11b23d929335f@syzkaller.appspotmail.com>,
kvalo@codeaurora.org, davem@davemloft.net, andreyknvl@google.com,
syzkaller-bugs@googlegroups.com, chunkeey@googlemail.com,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Cc: Michael Wu <flamingice@sourmilk.net>
Subject: Re: KASAN: use-after-free Read in p54u_load_firmware_cb
Date: Mon, 13 May 2019 15:28:30 +0200 [thread overview]
Message-ID: <1557754110.2793.7.camel@suse.com> (raw)
In-Reply-To: <00000000000073512b0588c24d09@google.com>
On Mo, 2019-05-13 at 03:23 -0700, syzbot wrote:
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit: 43151d6c usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=16b64110a00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234
> dashboard link: https://syzkaller.appspot.com/bug?extid=200d4bb11b23d929335f
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1634c900a00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+200d4bb11b23d929335f@syzkaller.appspotmail.com
>
> usb 1-1: config 0 descriptor??
> usb 1-1: reset high-speed USB device number 2 using dummy_hcd
> usb 1-1: device descriptor read/64, error -71
> usb 1-1: Using ep0 maxpacket: 8
> usb 1-1: Loading firmware file isl3887usb
> usb 1-1: Direct firmware load for isl3887usb failed with error -2
> usb 1-1: Firmware not found.
> ==================================================================
> BUG: KASAN: use-after-free in p54u_load_firmware_cb.cold+0x97/0x13a
> drivers/net/wireless/intersil/p54/p54usb.c:936
> Read of size 8 at addr ffff88809803f588 by task kworker/1:0/17
Hi,
it looks to me as if refcounting is broken.
You should have a usb_put_dev() in p54u_load_firmware_cb() or in
p54u_disconnect(), but not both.
Regards
Oliver
next prev parent reply other threads:[~2019-05-13 13:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 11:16 KASAN: use-after-free Read in p54u_load_firmware_cb syzbot
2019-05-13 10:23 ` syzbot
2019-05-13 13:28 ` Oliver Neukum [this message]
2019-05-17 19:21 ` Christian Lamparter
2019-05-17 20:46 ` Alan Stern
2019-05-17 21:01 ` syzbot
2019-05-18 15:13 ` Alan Stern
2019-05-18 15:50 ` syzbot
2019-05-18 16:32 ` Alan Stern
2019-05-18 16:50 ` syzbot
2019-05-18 17:01 ` Alan Stern
2019-05-18 17:36 ` syzbot
2019-05-18 17:49 ` Alan Stern
2019-05-18 18:31 ` syzbot
2019-05-18 20:11 ` Christian Lamparter
2019-05-20 14:44 ` [PATCH] network: wireless: p54u: Fix race between disconnect and firmware loading Alan Stern
2019-05-24 21:19 ` Christian Lamparter
2019-05-28 12:11 ` Kalle Valo
2019-05-28 14:17 ` Alan Stern
2019-05-28 14:29 ` Kalle Valo
2019-06-25 4:43 ` [PATCH] p54usb: " Kalle Valo
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