linux-kernel - Re: [PATCH AUTOSEL 5.10 29/62] Revert "ASoC: rt5645: fix a NULL pointer dereference"

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Message-ID: <YK1zgS7FwtySdeCg@sirena.org.uk>
Date:   Tue, 25 May 2021 23:00:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kangjie Lu <kjlu@....edu>, alsa-devel@...a-project.org
Subject: Re: [PATCH AUTOSEL 5.10 29/62] Revert "ASoC: rt5645: fix a NULL
 pointer dereference"

On Mon, May 24, 2021 at 10:47:10AM -0400, Sasha Levin wrote:

> Lots of things seem to be still allocated here and must be properly
> cleaned up if an error happens here.

That's not true, the core already has cleanup for everything else
(as the followup patch in your series identified, though it was a
bit confused as to how).

>  		RT5645_HWEQ_NUM, sizeof(struct rt5645_eq_param_s),
>  		GFP_KERNEL);
>  
> -	if (!rt5645->eq_param)
> -		return -ENOMEM;
> -

Without the followup patch (which I don't think is suitable for
stable) this will just remove error checking.  It's not likely to
happen and hence make a difference but on the other hand it
introduces a problem, especially when backported in isolation.

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