linux-kernel - Re: [PATCH] sound: codecs: fix a potential NULL pointer dereference

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Date:   Mon, 25 Mar 2019 12:15:20 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Bard Liao <bardliao@...ltek.com>,
        Oder Chiou <oder_chiou@...ltek.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
Subject: Re: [PATCH] sound: codecs: fix a potential NULL pointer dereference


On 3/25/2019 4:42 AM, Kangjie Lu wrote:
> In case devm_kzalloc fails, the patch returns -ENOMEM to avoid
> potential NULL pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>   sound/soc/codecs/rt5663.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
> index da6647015708..909ab99a1995 100644
> --- a/sound/soc/codecs/rt5663.c
> +++ b/sound/soc/codecs/rt5663.c
> @@ -3480,6 +3480,8 @@ static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
>   		table_size = sizeof(struct impedance_mapping_table) *
>   			rt5663->pdata.impedance_sensing_num;
>   		rt5663->imp_table = devm_kzalloc(dev, table_size, GFP_KERNEL);
> +		if (!rt5663->imp_table)
> +			return -ENOMEM;

add checks in rt5663_parse_dp  as well.

Thanks.
Mukesh


>   		device_property_read_u32_array(dev,
>   			"realtek,impedance_sensing_table",
>   			(u32 *)rt5663->imp_table, table_size);