[patch] hp-wmi: fix double free

[patch] hp-wmi: fix double free

[Dan Carpenter]

kfree(obj) was called earlier.

This was found by smatch and has only been compile tested.  :/

Signed-off-by: Dan Carpenter <error27@gmail.com>

--- orig/drivers/platform/x86/hp-wmi.c	2010-01-09 21:43:13.000000000 +0300
+++ devel/drivers/platform/x86/hp-wmi.c	2010-01-09 21:43:28.000000000 +0300
@@ -388,8 +388,6 @@ static void hp_wmi_notify(u32 value, voi
 	} else
 		printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 			eventcode);
-
-	kfree(obj);
 }
 
 static int __init hp_wmi_input_setup(void)

Re: [patch] hp-wmi: fix double free

[Alan Jenkins]

On 1/10/10, Dan Carpenter <error27@gmail.com> wrote:
> kfree(obj) was called earlier.
>
> This was found by smatch and has only been compile tested.  :/

I don't see hp-wmi in MAINTAINERS, but in general platform drivers go
via the ACPI tree.

It looks like several others have discovered this issue the hard way
:-).  <http://www.pubbs.net/kernel/201001/14288/>.

Fortunately it has been fixed in the acpi tree and now submitted to
Linus.  <http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-01/msg02511.html>.

Regards
Alan

> --- orig/drivers/platform/x86/hp-wmi.c	2010-01-09 21:43:13.000000000 +0300
> +++ devel/drivers/platform/x86/hp-wmi.c	2010-01-09 21:43:28.000000000 +0300
> @@ -388,8 +388,6 @@ static void hp_wmi_notify(u32 value, voi
>  	} else
>  		printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
>  			eventcode);
> -
> -	kfree(obj);
>  }