linux-kernel - Re: [PATCH 1/1] media: si470x-i2c: Move free() past last use of 'radio'

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Message-ID: <20200203151208.GD15069@dell>
Date:   Mon, 3 Feb 2020 15:12:08 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Greg KH <greg@...ah.com>
Cc:     stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] media: si470x-i2c: Move free() past last use of
 'radio'

On Mon, 03 Feb 2020, Greg KH wrote:

> On Mon, Feb 03, 2020 at 02:32:45PM +0000, Greg KH wrote:
> > On Mon, Feb 03, 2020 at 01:21:30PM +0000, Lee Jones wrote:
> > > A pointer to 'struct si470x_device' is currently used after free:
> > > 
> > >   drivers/media/radio/si470x/radio-si470x-i2c.c:462:25-30: ERROR: reference
> > >     preceded by free on line 460
> > > 
> > > Shift the call to free() down past its final use.
> > > 
> > > NB: Not sending to Mainline, since the problem does not exist there.
> > 
> > It doesn't exist there because of a bad merge?  What commit caused the
> > problem?
> 
> Ah, found it, it was 2df200ab234a ("media: si470x-i2c: add missed
> operations in remove")

I was about to follow up with a v2:

  "NB: Cauased during the backporting of upstream commit 2df200ab234a
   ("media: si470x-i2c: add missed operations in remove").  This issue does
   not exist in Mainline since the kfree() was removed in v5.0 as part of
   commit f86c51b66bf6 ("media: si470x-i2c: Use managed resource helpers")."

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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