Re: [syzbot] KASAN: use-after-free Read in r871xu_dev_remove

[Dongliang Mu]

On Tue, Jul 13, 2021 at 4:55 PM Pavel Skripkin <paskripkin@xxxxxxxxx> wrote:
>
> On Mon, 12 Jul 2021 20:14:24 -0700
> syzbot <syzbot+5872a520e0ce0a7c7230@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    92510a7f Add linux-next specific files for 20210709
> > git tree:       linux-next
> > console output:
> > https://syzkaller.appspot.com/x/log.txt?x=16c50180300000 kernel
> > config:  https://syzkaller.appspot.com/x/.config?x=505de2716f052686
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=5872a520e0ce0a7c7230 syz
> > repro:
> > https://syzkaller.appspot.com/x/repro.syz?x=1639a73c300000 C
> > reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15fcd5e4300000
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the
> > commit: Reported-by:
> > syzbot+5872a520e0ce0a7c7230@xxxxxxxxxxxxxxxxxxxxxxxxx
> >
>
> Hmm, bisection is wrong this time. It should be
> e02a3b945816 ("staging: rtl8712: fix memory leak in rtl871x_load_fw_cb")

Hi Paval,

can you share more details about why the patch e02a3b945816 causes
this UAF problem?

>
> #syz test:
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>
>
> I guess, this should work
>
>
> With regards,
> Pavel Skripkin
>
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