linux-kernel - Re: [PATCH] firmware: fix async/manual firmware loading

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Date:   Wed, 9 Nov 2016 21:39:21 +0100
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Yves-Alexis Perez <corsac@...sac.net>
Cc:     linux-kernel@...r.kernel.org,
        Yves-Alexis Perez <corsac@...ian.org>,
        Ming Lei <ming.lei@...onical.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johannes Berg <johannes@...solutions.net>,
        Jouni Malinen <j@...fi>, Kees Cook <keescook@...omium.org>,
        Jiri Kosina <jkosina@...e.cz>, Jiri Slaby <jslaby@...e.com>,
        Tom Gundersen <teg@...m.no>, Kay Sievers <kay@...y.org>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Harald Hoyer <harald@...hat.com>,
        Seth Forshee <seth.forshee@...onical.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Wagner <wagi@...om.org>, stable@...r.kernel.org
Subject: Re: [PATCH] firmware: fix async/manual firmware loading

On Sun, Oct 30, 2016 at 03:50:48PM +0100, Yves-Alexis Perez wrote:
> From: Yves-Alexis Perez <corsac@...ian.org>
> 
> wait_for_completion_interruptible_timeout() return value is either
> -ERESTARTSYS (in case it was interrupted), 0 (in case the timeout expired)
> or the number of jiffies left until timeout. The return value is stored in
> a long, but in _request_firmware_load() it's silently casted to an int,
> which can overflow and give a negative value, indicating an error.
> 
> Fix this by re-using the timeout variable and only set retval when it's
> safe.

Please amend the commit log as I noted in the previous response, and
resend.

> Signed-off-by: Yves-Alexis Perez <corsac@...sac.net>
> Cc: Ming Lei <ming.lei@...onical.com>
> Cc: "Luis R. Rodriguez" <mcgrof@...nel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Other than the commit log you can add on you resend:

Acked-by: Luis R. Rodriguez.

Modulo I don't personally thing this this is sable material but I'll let
Greg decide.

  Luis

> Cc: stable@...r.kernel.org
> 
> ---
>  drivers/base/firmware_class.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 22d1760..a95e1e5 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -955,13 +955,14 @@ static int _request_firmware_load(struct firmware_priv *fw_priv,
>  		timeout = MAX_JIFFY_OFFSET;
>  	}
>  
> -	retval = wait_for_completion_interruptible_timeout(&buf->completion,
> +	timeout = wait_for_completion_interruptible_timeout(&buf->completion,
>  			timeout);
> -	if (retval == -ERESTARTSYS || !retval) {
> +	if (timeout == -ERESTARTSYS || !timeout) {
> +		retval = timeout;
>  		mutex_lock(&fw_lock);
>  		fw_load_abort(fw_priv);
>  		mutex_unlock(&fw_lock);
> -	} else if (retval > 0) {
> +	} else if (timeout > 0) {
>  		retval = 0;
>  	}
>  
> -- 
> 2.10.1
> 
> 

-- 
Luis Rodriguez, SUSE LINUX GmbH
Maxfeldstrasse 5; D-90409 Nuernberg