linux-kernel - Re: [PATCH v4] ASoC: samsung: i2s: Null pointer dereference on samsung_i2s

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Message-ID: <20170815172958.q2kd75w2p2seypsa@kozik-lap>
Date:   Tue, 15 Aug 2017 19:29:58 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Anton Vasilyev <vasilyev@...ras.ru>
Cc:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH v4] ASoC: samsung: i2s: Null pointer dereference on
 samsung_i2s_remove

On Tue, Aug 15, 2017 at 03:19:54PM +0300, Anton Vasilyev wrote:
> If (quirks & QUIRK_SEC_DAI == 0) then samsung_i2s_probe() doesn't allocate
> sec_dai and pri_dai->sec_dai remains Null, but samsung_i2s_remove()
> performs pri_dai->sec_dai dereference in any case.
> 
> The patch removes useless reinitialization of sec_dai at
> samsung_i2s_remove(), because resources are under devm control.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
> ---
> v2: Drop initialization of sec_dai by NULL at samsung_i2s_remove
> as Sylwester Nawrocki suggest.
> ---
> v3: Fix typo in the comment
> ---
> v4: Change comment based on Krzysztof review.
> ---
>  sound/soc/samsung/i2s.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 

Acked-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof