linux-kernel - Re: [PATCH] swsusp: Fix possible oops in userland interface

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Message-ID: <20070225195431.GD1746@elf.ucw.cz>
Date:	Sun, 25 Feb 2007 20:54:31 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	stable@...nel.org, LKML <linux-kernel@...r.kernel.org>,
	Stefan Seyfried <seife@...e.de>
Subject: Re: [PATCH] swsusp: Fix possible oops in userland interface

Hi!

> From: Stefan Seyfried <seife@...e.de>
> 
> Fix the Oops occuring when SNAPSHOT_PMOPS or SNAPSHOT_S2RAM ioctl is called on
> a system without pm_ops defined (eg. a non-ACPI kernel on x86 PC).
> 
> Signed-off-by: Stefan Seyfried <seife@...e.de>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

ACK.
									Pavel
> ---
> 
>  user.c |   19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> --- a/kernel/power/user.c	2007-02-01 01:07:38.000000000 +0100
> +++ b/kernel/power/user.c	2007-02-01 22:25:48.000000000 +0100
> @@ -292,7 +292,7 @@ static int snapshot_ioctl(struct inode *
>  			break;
>  		}
>  
> -		if (pm_ops->prepare) {
> +		if (pm_ops && pm_ops->prepare) {
>  			error = pm_ops->prepare(PM_SUSPEND_MEM);
>  			if (error)
>  				goto OutS3;
> @@ -311,7 +311,7 @@ static int snapshot_ioctl(struct inode *
>  			device_resume();
>  		}
>  		resume_console();
> -		if (pm_ops->finish)
> +		if (pm_ops && pm_ops->finish)
>  			pm_ops->finish(PM_SUSPEND_MEM);
>  
>   OutS3:
> @@ -322,20 +322,25 @@ static int snapshot_ioctl(struct inode *
>  		switch (arg) {
>  
>  		case PMOPS_PREPARE:
> -			if (pm_ops->prepare) {
> +			if (pm_ops && pm_ops->prepare)
>  				error = pm_ops->prepare(PM_SUSPEND_DISK);
> -			}
> +			else
> +				error = -ENOSYS;
>  			break;
>  
>  		case PMOPS_ENTER:
>  			kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
> -			error = pm_ops->enter(PM_SUSPEND_DISK);
> +			if (pm_ops && pm_ops->enter)
> +				error = pm_ops->enter(PM_SUSPEND_DISK);
> +			else
> +				error = -ENOSYS;
>  			break;
>  
>  		case PMOPS_FINISH:
> -			if (pm_ops && pm_ops->finish) {
> +			if (pm_ops && pm_ops->finish)
>  				pm_ops->finish(PM_SUSPEND_DISK);
> -			}
> +			else
> +				error = -ENOSYS;
>  			break;
>  
>  		default:

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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