linux-kernel - Re: [PATCH] net: ax88179: add proper error handling of usb read errors

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Date:   Tue, 19 Apr 2022 15:41:45 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     David Kahurani <k.kahurani@...il.com>, netdev@...r.kernel.org
Cc:     syzbot+d3dbdf31fbe9d8f5f311@...kaller.appspotmail.com,
        davem@...emloft.net, jgg@...pe.ca, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        phil@...lpotter.co.uk, syzkaller-bugs@...glegroups.com,
        arnd@...db.de, dan.carpenter@...cle.com
Subject: Re: [PATCH] net: ax88179: add proper error handling of usb read
 errors

On Sat, 2022-04-16 at 10:48 +0300, David Kahurani wrote:
> Reads that are lesser than the requested size lead to uninit-value bugs.
> In this particular case a variable which was supposed to be initialized
> after a read is left uninitialized after a partial read.
> 
> Qualify such reads as errors and handle them correctly and while at it
> convert the reader functions to return zero on success for easier error
> handling.
> 
> Fixes: e2ca90c276e1 ("ax88179_178a: ASIX AX88179_178A USB 3.0/2.0 to
> gigabit ethernet adapter driver")

In the next version, please additionally fix the above tag: it must use
a single line, even if that means exceeding the 72 chars length limit.

Thanks!

Paolo