linux-kernel - Re: [PATCH] spi: Fix use-after-free with devm_spi_alloc

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Message-ID: <20210408131157.GD4516@sirena.org.uk>
Date:   Thu, 8 Apr 2021 14:11:57 +0100
From:   Mark Brown <broonie@...nel.org>
To:     "William A. Kennington III" <wak@...gle.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joel Stanley <joel@....id.au>
Subject: Re: [PATCH] spi: Fix use-after-free with devm_spi_alloc_*

On Wed, Apr 07, 2021 at 02:55:27AM -0700, William A. Kennington III wrote:

> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174
> [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98)
> [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24)
>  r4:b6700140

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.

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