linux-kernel - RE: [PATCH] ASoC: test-component: fix null pointer dereference.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <TYCPR01MB55813B26BB2B3BB6D1E072F2D46C9@TYCPR01MB5581.jpnprd01.prod.outlook.com>
Date:   Sun, 5 Dec 2021 22:40:27 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Ameer Hamza <amhamza.mgc@...il.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ASoC: test-component: fix null pointer dereference.


Hi Ameer

Thank you for your patch.

> Dereferncing of_id pointer will result in exception in current
> implementation since of_match_device() will assign it to NULL.
> Adding NULL check for protection.
(snip)
> @@ -532,13 +532,16 @@ static int test_driver_probe(struct platform_device *pdev)
>  	struct device_node *node = dev->of_node;
>  	struct device_node *ep;
>  	const struct of_device_id *of_id = of_match_device(test_of_match, &pdev->dev);
> -	const struct test_adata *adata = of_id->data;
> +	const struct test_adata *adata;
>  	struct snd_soc_component_driver *cdriv;
>  	struct snd_soc_dai_driver *ddriv;
>  	struct test_dai_name *dname;
>  	struct test_priv *priv;
>  	int num, ret, i;
>  
> +	if (!of_id)
> +		return -EINVAL;
> +	adata = of_id->data;

But hmm...
Probing this driver without adata is strange for me.
How did probe this driver ??

Best regards
---
Kuninori Morimoto