linux-kernel - Re: [PATCH RFT] net: asix: add proper error handling of usb read errors

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Message-ID: <YeZbzM6TDCIEvCUc@kroah.com>
Date:   Tue, 18 Jan 2022 07:18:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, linux@...pel-privat.de,
        andrew@...n.ch, oneukum@...e.com, robert.foss@...labora.com,
        freddy@...x.com.tw, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+6ca9f7867b77c2d316ac@...kaller.appspotmail.com
Subject: Re: [PATCH RFT] net: asix: add proper error handling of usb read
 errors

On Mon, Jan 17, 2022 at 10:31:21PM +0300, Pavel Skripkin wrote:
> On 1/5/22 16:19, Pavel Skripkin wrote:
> > Syzbot once again hit uninit value in asix driver. The problem still the
> > same -- asix_read_cmd() reads less bytes, than was requested by caller.
> > 
> > Since all read requests are performed via asix_read_cmd() let's catch
> > usb related error there and add __must_check notation to be sure all
> > callers actually check return value.
> > 
> > So, this patch adds sanity check inside asix_read_cmd(), that simply
> > checks if bytes read are not less, than was requested and adds missing
> > error handling of asix_read_cmd() all across the driver code.
> > 
> > Fixes: d9fe64e51114 ("net: asix: Add in_pm parameter")
> > Reported-and-tested-by: syzbot+6ca9f7867b77c2d316ac@...kaller.appspotmail.com
> > Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> > ---
> 
> gentle ping :)

It's the middle of a merge window, and you ask for testing before it can
be applied?

confused,

greg k-h