From: Eric Biggers <ebiggers@kernel.org>
To: Oliver Neukum <oneukum@suse.com>
Cc: syzbot <syzbot+0c90fc937c84f97d0aa6@syzkaller.appspotmail.com>,
keescook@chromium.org, andreyknvl@google.com,
syzkaller-bugs@googlegroups.com, mchehab@kernel.org,
tglx@linutronix.de, sakari.ailus@linux.intel.com,
kstewart@linuxfoundation.org, allison@lohutok.net,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
linux-usb@vger.kernel.org, hverkuil-cisco@xs4all.nl
Subject: Re: KASAN: use-after-free Read in cpia2_usb_disconnect
Date: Wed, 3 Jul 2019 10:10:09 -0700 [thread overview]
Message-ID: <20190703171008.GA10080@gmail.com> (raw)
In-Reply-To: <1562139729.5819.28.camel@suse.com>
On Wed, Jul 03, 2019 at 09:42:09AM +0200, Oliver Neukum wrote:
> Am Dienstag, den 02.07.2019, 18:01 -0700 schrieb syzbot:
> > syzbot has found a reproducer for the following crash on:
> >
> > HEAD commit: 7829a896 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=11e19043a00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=f6d4561982f71f63
> > dashboard link: https://syzkaller.appspot.com/bug?extid=0c90fc937c84f97d0aa6
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=147d42eda00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=104c268ba00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+0c90fc937c84f97d0aa6@syzkaller.appspotmail.com
> >
> > cpia2: Message: count = 1, register[0] = 0x0
> > cpia2: Unexpected error: -19
> > ==================================================================
> > BUG: KASAN: use-after-free in cpia2_usb_disconnect+0x1a4/0x1c0
> > drivers/media/usb/cpia2/cpia2_usb.c:898
> > Read of size 8 at addr ffff8881cf6c4e50 by task kworker/1:1/22
>
> Please try this:
>
> From a0a73298fc23acb95e7b6487e960be707563eb34 Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <oneukum@suse.com>
> Date: Wed, 8 May 2019 12:36:40 +0200
> Subject: [PATCH] cpia2_usb: first wake up, then free in disconnect
>
Who are you talking to? If you want syzbot to test your patch, follow the
directions at https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches
- Eric
next prev parent reply other threads:[~2019-07-03 17:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-16 11:16 KASAN: use-after-free Read in cpia2_usb_disconnect syzbot
2019-07-03 1:01 ` syzbot
2019-07-03 7:42 ` Oliver Neukum
2019-07-03 17:10 ` Eric Biggers [this message]
2019-07-04 9:36 ` Oliver Neukum
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