linux-kernel - Re: KASAN: invalid-free in disconnect

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Date:   Tue, 30 Apr 2019 14:58:36 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     syzbot <syzbot+35f04d136fc975a70da4@...kaller.appspotmail.com>,
        miquel@...uba.ar, andreyknvl@...gle.com,
        syzkaller-bugs@...glegroups.com, gregkh@...uxfoundation.org,
        rio500-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: KASAN: invalid-free in disconnect_rio

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@...kaller.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