linux-kernel - Re: [Linux-kernel-mentees][PATCH v2] nl80211: Fix undefined behavior in bit shift

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Message-ID: <8b8c44c3ecb8626d9bb5a8f786b1d2b7488df86b.camel@sipsolutions.net>
Date:   Fri, 28 Jun 2019 15:57:05 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        Jiunn Chang <c0d1n61at3@...il.com>
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees][PATCH v2] nl80211: Fix undefined
 behavior in bit shift

On Wed, 2019-06-26 at 21:34 -0600, Shuah Khan wrote:
> On 6/26/19 9:25 PM, Jiunn Chang wrote:
> > Shifting signed 32-bit value by 31 bits is undefined.  Changing most
> > significant bit to unsigned.
> > 
> > Changes included in v2:
> >    - use subsystem specific subject lines
> >    - CC required mailing lists
> > 
> > Signed-off-by: Jiunn Chang <c0d1n61at3@...il.com>
> > ---
> 
> Move version change lines here. They don't belong in the commit log.

FWIW, in many cases people (maintainers) now *do* want them in the
commit log. Here, they're just editorial, so agree, but if real
technical changes were made due to reviews, they can indeed be useful.

johannes