netdev - Re: [syzbot] KMSAN: uninit-value in asix_mdio

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Date:   Sun, 19 Dec 2021 00:14:30 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+f44badb06036334e867a@...kaller.appspotmail.com>,
        andrew@...n.ch, davem@...emloft.net, glider@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux@...pel-privat.de,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KMSAN: uninit-value in asix_mdio_read (2)

On 12/18/21 14:07, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    b0a8b5053e8b kmsan: core: add dependency on DEBUG_KERNEL
> git tree:       https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=13a4d133b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=46a956fc7a887c60
> dashboard link: https://syzkaller.appspot.com/bug?extid=f44badb06036334e867a
> compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=149fddcbb00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17baef25b00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+f44badb06036334e867a@...kaller.appspotmail.com
> 

The last unhanded case is asix_read_cmd() == 0. Let's handle it...

#syz test: https://github.com/google/kmsan.git master



With regards,
Pavel Skripkin


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