linux-kernel - Re: KASAN: null-ptr-deref Write in bdi

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Message-ID: <86fb6e46-2796-3967-3578-5b80d70bef2f@kernel.dk>
Date:   Mon, 1 Mar 2021 07:35:30 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+aded2f2ab94d81727898@...kaller.appspotmail.com>,
        aik@...abs.ru, akpm@...ux-foundation.org, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mingo@...nel.org,
        mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org,
        syzkaller-bugs@...glegroups.com, will@...nel.org
Subject: Re: KASAN: null-ptr-deref Write in bdi_put

On 3/1/21 5:56 AM, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 2d2f6f1b4799428d160c021dd652bc3e3593945e
> Author: Christoph Hellwig <hch@....de>
> Date:   Thu Jan 7 18:36:40 2021 +0000
> 
>     block: pre-initialize struct block_device in bdev_alloc_inode
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1424a5b6d00000
> start commit:   71c061d2 Merge tag 'for-5.11-rc2-tag' of git://git.kernel...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=33b7f56c5bf0f684
> dashboard link: https://syzkaller.appspot.com/bug?extid=aded2f2ab94d81727898
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=143f7fc0d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1089023f500000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: block: pre-initialize struct block_device in bdev_alloc_inode


-- 
Jens Axboe