linux-kernel - Re: [PATCH] init: Fix crash observed if there is no initial console

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Date:   Wed, 18 Dec 2019 15:14:22 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] init: Fix crash observed if there is no initial console

On Wed, Dec 18, 2019 at 03:01:49PM -0800, Guenter Roeck wrote:
> Systems with no initial console crash in f_dupfd(). This happens because
> console_on_rootfs() was changed to call filp_open(). Its return value
> (a file pointer) is checked against NULL, but returns an ERR_PTR after
> errors. This ERR_PTR is then passed as file parameter to f_dupfd(),
> which experiences a severe case of indigestion.
> 

I should have pulled upstream before sending this. Sorry for the noise.

Guenter

> Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Fixes: 8243186f0cc7 ("fs: remove ksys_dup()"),
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  init/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/init/main.c b/init/main.c
> index ec3a1463ac69..1ecfd43ed464 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -1163,7 +1163,7 @@ void console_on_rootfs(void)
>  
>  	/* Open /dev/console in kernelspace, this should never fail */
>  	file = filp_open("/dev/console", O_RDWR, 0);
> -	if (!file)
> +	if (IS_ERR(file))
>  		goto err_out;
>  
>  	/* create stdin/stdout/stderr, this should never fail */
> -- 
> 2.17.1
>