linux-kernel - Re: acpi_battery_add(): use-after-free

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Message-Id: <20070730153420.317ae2ee.akpm@linux-foundation.org>
Date:	Mon, 30 Jul 2007 15:34:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: acpi_battery_add(): use-after-free

On Sun, 29 Jul 2007 17:00:46 +0200
Adrian Bunk <bunk@...sta.de> wrote:

> The Coverity checker spotted the following use-after-free in 
> acpi_battery_add():
> 
> <--  snip  -->
> 
> ...
> static int acpi_battery_add(struct acpi_device *device)
> {
> ...
>         if (result) {
>                 acpi_battery_remove_fs(device);
>                 kfree(battery);
>         }
> 
>         mutex_unlock(&battery->mutex);
> ...
> 
> <--  snip  -->
> 

This?

--- a/drivers/acpi/battery.c~acpi_battery_add-use-after-free
+++ a/drivers/acpi/battery.c
@@ -931,13 +931,12 @@ static int acpi_battery_add(struct acpi_
 
       end:
 
+	mutex_unlock(&battery->mutex);
 	if (result) {
 		acpi_battery_remove_fs(device);
 		kfree(battery);
 	}
 
-	mutex_unlock(&battery->mutex);
-
 	return result;
 }
 
_

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