linux-kernel - Re: [RFC PATCH] spi: fix use-after-free of the add

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Message-ID: <YYv12vhqDVpJ1lS9@sirena.org.uk>
Date:   Wed, 10 Nov 2021 16:39:54 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Vladimir Oltean <olteanv@...il.com>
Subject: Re: [RFC PATCH] spi: fix use-after-free of the add_lock mutex

On Wed, Nov 10, 2021 at 05:30:48PM +0100, Michael Walle wrote:
> Am 2021-11-10 17:27, schrieb Mark Brown:

> > > For reference, the kernel oops is:
> > > [   20.242505] Unable to handle kernel paging request at virtual
> > > address 0042a2203dc65260
> > > [   20.250468] Mem abort info:
> > > [   20.253270]   ESR = 0x96000044

> > Please think hard before including complete backtraces in upstream
> > reports, they are very large and contain almost no useful information
> > relative to their size so often obscure the relevant content in your
> > message. If part of the backtrace is usefully illustrative (it often is
> > for search engines if nothing else) then it's usually better to pull out
> > the relevant sections.

> It was in the comments section of the patch, for exactly this purpose.
> That's how you're doing it, no?

That helps with what ends up in git but it's still including multiple
screenfuls of noise in the email which is where the usability problem
is.

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