Re: [PATCH 1/3] arch/x86/kernel/cpu/mcheck/mce_amd.c: Avoidleaving freed data in a list

[Borislav Petkov]

On Fri, May 13, 2011 at 09:52:09AM -0400, Julia Lawall wrote:
> b may be added to a list, but is not removed before being freed in the case
> of an error.  This is done in the corresponding deallocation function, so
> the code here has been changed to follow that.
> 
> The sematic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression E,E1,E2;
> identifier l;
> @@
> 
> *list_add(&E->l,E1);
> ... when != E1
>     when != list_del(&E->l)
>     when != list_del_init(&E->l)
>     when != E = E2
> *kfree(E);// </smpl>
> 
> Signed-off-by: Julia Lawall <julia@xxxxxxx>

Acked-by: Borislav Petkov <borislav.petkov@xxxxxxx>

> 
> ---
>  arch/x86/kernel/cpu/mcheck/mce_amd.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> index 167f97b..bb0adad 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> @@ -509,6 +509,7 @@ recurse:
>  out_free:
>  	if (b) {
>  		kobject_put(&b->kobj);
> +		list_del(&b->miscj);
>  		kfree(b);
>  	}
>  	return err;
> 
> 

-- 
Regards/Gruss,
Boris.

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