On Fri, Nov 25, 2016 at 03:57:51PM +0200, Laurent Pinchart wrote:
> diff --git a/mm/slab.c b/mm/slab.c
> index 0b0550ca85b4..a7eb830c6684 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3819,6 +3819,8 @@ void kfree(const void *objp)
>  
>       if (unlikely(ZERO_OR_NULL_PTR(objp)))
>               return;
> +     if (WARN_ON(IS_ERR(objp)))
> +             return;
>       local_irq_save(flags);
>       kfree_debugcheck(objp);
>       c = virt_to_cache(objp);
> 

A bunch of people have proposed that.  You're the first person to
actually write up a patch.  Feel free to send it.  ;)

regards,
dan carpenter

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