linux-kernel - Re: [syzbot] KASAN: use-after-free Read in __vma

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Message-ID: <20220615164500.oxg3tbhr44jhbkz4@revolver>
Date:   Wed, 15 Jun 2022 16:45:07 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     syzbot <syzbot+68771c0e74f7bb7804e5@...kaller.appspotmail.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "willy@...radead.org" <willy@...radead.org>
Subject: Re: [syzbot] KASAN: use-after-free Read in __vma_adjust

* syzbot <syzbot+68771c0e74f7bb7804e5@...kaller.appspotmail.com> [220612 18:08]:
> syzbot has bisected this issue to:
> 
> commit d3ccd17e7c9647b956d415acdf3e3fde7ae9e20c
> Author: Liam R. Howlett <Liam.Howlett@...cle.com>
> Date:   Thu Jun 9 20:57:09 2022 +0000
> 
>     mm: start tracking VMAs with maple tree
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11463853f00000
> start commit:   6d0c80680317 Add linux-next specific files for 20220610
> git tree:       linux-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=13463853f00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=15463853f00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a30d6e3e814e5931
> dashboard link: https://syzkaller.appspot.com/bug?extid=68771c0e74f7bb7804e5
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e632bbf00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=103df80ff00000
> 
> Reported-by: syzbot+68771c0e74f7bb7804e5@...kaller.appspotmail.com
> Fixes: d3ccd17e7c96 ("mm: start tracking VMAs with maple tree")

Thank you.  This is a valid issue and I have sent a fix [1].

1. https://lore.kernel.org/linux-mm/20220615164150.652376-1-Liam.Howlett@oracle.com/

Regards,
Liam