linux-kernel - Re: [PATCH] memory: tegra: Fix an error handling path in 'tegra186_emc

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: <20200508084941.GE9365@kadam>
Date:   Fri, 8 May 2020 11:49:41 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     thierry.reding@...il.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] memory: tegra: Fix an error handling path in
 'tegra186_emc_probe()'

On Wed, May 06, 2020 at 10:09:07PM +0200, Christophe JAILLET wrote:
> @@ -237,7 +239,7 @@ static int tegra186_emc_probe(struct platform_device *pdev)
>  			"failed to set rate range [%lu-%lu] for %pC\n",
>  			emc->debugfs.min_rate, emc->debugfs.max_rate,
>  			emc->clk);
> -		return err;
> +		goto err_put_bpmp;
>  	}
>  
>  	emc->debugfs.root = debugfs_create_dir("emc", NULL);

Not really related to this patch but the error handling on this
debugfs_create_dir() call is wrong.  It never returns NULL.  The error
should just be ignored.  It shouldn't try print a message when debugfs
is deliberately disabled.

As in the correct code looks like:

 
        emc->debugfs.root = debugfs_create_dir("emc", NULL);
-       if (!emc->debugfs.root) {
-               dev_err(&pdev->dev, "failed to create debugfs directory\n");
-               return 0;
-       }
-
        debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root,
                            emc, &tegra186_emc_debug_available_rates_fops);
        debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,

debugfs_create_file() will return an error pointer if debugfs_create_dir()
fails or if debugfs is disabled.  (It is a no-op).

regards,
dan carpenter