linux-kernel - Re: [PATCH 2/2] lib/test_printf: add test of null/invalid pointer dereference for dentry

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Date:   Fri, 16 Aug 2019 10:26:42 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Jia He <justin.he@....com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>,
        "Tobin C. Harding" <tobin@...nel.org>
Subject: Re: [PATCH 2/2] lib/test_printf: add test of null/invalid pointer
 dereference for dentry

On Fri 2019-08-09 09:24:57, Jia He wrote:
> This add some additional test cases of null/invalid pointer dereference
> for dentry and file (%pd and %pD)
> 
> Signed-off-by: Jia He <justin.he@....com>
> ---
>  lib/test_printf.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 944eb50f3862..befedffeb476 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -455,6 +455,13 @@ dentry(void)
>  	test("foo", "%pd", &test_dentry[0]);
>  	test("foo", "%pd2", &test_dentry[0]);
>  
> +	/* test the null/invalid pointer case for dentry */
> +	test("(null)", "%pd", NULL);
> +	test("(efault)", "%pd", PTR_INVALID);
> +	/* test the null/invalid pointer case for file */

The two comments mention something that is obvious from the code.

I have pushed the patch as is and removed the comments in
a follow up patch [1]. Both are in printk.git, branch for-5.4.

> +	test("(null)", "%pD", NULL);
> +	test("(efault)", "%pD", PTR_INVALID);

Reference:
[1] https://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk.git/commit/?h=for-5.4&id=8ebea6ea1a7ed5d67ecbb2a493c716a2a89c0be2

Best Regards,
Petr