From: Oliver Neukum <oneukum@suse.com>
To: syzbot <syzbot+35f04d136fc975a70da4@syzkaller.appspotmail.com>,
miquel@df.uba.ar, andreyknvl@google.com,
syzkaller-bugs@googlegroups.com, gregkh@linuxfoundation.org,
rio500-users@lists.sourceforge.net, linux-kernel@vger.kernel.org,
linux-usb@vger.kernel.org
Subject: Re: KASAN: invalid-free in disconnect_rio
Date: Tue, 30 Apr 2019 14:58:36 +0200 [thread overview]
Message-ID: <1556629116.20085.32.camel@suse.com> (raw)
In-Reply-To: <0000000000008d15ee058653b53e@google.com>
On Fr, 2019-04-12 at 04:36 -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 9a33b369 usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan/tree/usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=174ce2e3200000
> kernel config: https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
> dashboard link: https://syzkaller.appspot.com/bug?extid=35f04d136fc975a70da4
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138150f3200000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1290c22d200000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+35f04d136fc975a70da4@syzkaller.appspotmail.com
>
> usb 6-1: USB disconnect, device number 2
> rio500 3-1:0.110: USB Rio disconnected.
> usb 4-1: USB disconnect, device number 2
> ==================================================================
> usb 1-1: USB disconnect, device number 2
> BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3003 [inline]
> BUG: KASAN: double-free or invalid-free in kfree+0xce/0x290 mm/slub.c:3958
> usb 2-1: USB disconnect, device number 2
>
Try as I might, I don't understand this. I can see a memory leak,
but not a double free.
Regards
Oliver
next prev parent reply other threads:[~2019-04-30 12:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 11:36 KASAN: invalid-free in disconnect_rio syzbot
2019-04-30 12:58 ` Oliver Neukum [this message]
2019-04-30 13:02 ` Andrey Konovalov
2019-04-30 13:49 ` Oliver Neukum
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