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From: Andrew Lunn <andrew@lunn.ch>
To: Pavel Skripkin <paskripkin@gmail.com>
Cc: davem@davemloft.net, kuba@kernel.org, linux@rempel-privat.de,
	robert.foss@collabora.com, linux-usb@vger.kernel.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzbot+a631ec9e717fb0423053@syzkaller.appspotmail.com
Subject: Re: [PATCH v3] net: asix: fix uninit value bugs
Date: Sat, 14 Aug 2021 17:36:54 +0200	[thread overview]
Message-ID: <YRfjFr9GbcoJrycc@lunn.ch> (raw)
In-Reply-To: <20210814135505.11920-1-paskripkin@gmail.com>

On Sat, Aug 14, 2021 at 04:55:05PM +0300, Pavel Skripkin wrote:
> Syzbot reported uninit-value in asix_mdio_read(). The problem was in
> missing error handling. asix_read_cmd() should initialize passed stack
> variable smsr, but it can fail in some cases. Then while condidition
> checks possibly uninit smsr variable.
> 
> Since smsr is uninitialized stack variable, driver can misbehave,
> because smsr will be random in case of asix_read_cmd() failure.
> Fix it by adding error handling and just continue the loop instead of
> checking uninit value.
> 
> Also, same loop was used in 3 other functions. Fixed uninit value bug
> in them too.

Hi Pavel

Which suggests it might make sense to refactor the code to make a
helper? I will leave you to decide if you want to do that.

The code does looks correct now.

	Andrew

  reply	other threads:[~2021-08-14 15:37 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-13 16:01 [PATCH] net: asix: fix uninit value in asix_mdio_read Pavel Skripkin
2021-08-13 22:23 ` Andrew Lunn
2021-08-13 22:29   ` Pavel Skripkin
2021-08-13 22:42   ` [PATCH v2] " Pavel Skripkin
2021-08-13 22:52     ` Jakub Kicinski
2021-08-14 13:55       ` [PATCH v3] net: asix: fix uninit value bugs Pavel Skripkin
2021-08-14 15:36         ` Andrew Lunn [this message]
2021-08-14 15:40           ` Pavel Skripkin
2021-08-14 16:20           ` Pavel Skripkin
2021-08-17 16:37           ` [PATCH v4] " Pavel Skripkin
2021-08-18 10:50             ` patchwork-bot+netdevbpf
2021-08-13 22:57     ` [PATCH v2] net: asix: fix uninit value in asix_mdio_read Andrew Lunn

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