Re: [PATCH linux 2/2] net sched actions: fix refcount decrement on error

[Roman Mashak]

Wolfgang Bumiller <w.bumil...@proxmox.com> writes:

> If memory allocation for nla_memdup_cookie() fails
> module_put has to be guarded by the same condition as it was
> before the TCA_ACT_COOKIE has been added as stated in the
> comment afterwards:
>

What if a new entry has been created, and a_o->init returns
ACT_P_CREATED, but cookie allocation fails, do we not remove module
reference count?

[...]

>               if (cklen > TC_COOKIE_MAX_SIZE) {
> -                     err = -EINVAL;
>                       tcf_hash_release(a, bind);
> -                     goto err_mod;
> +                     if (err != ACT_P_CREATED)
> +                             module_put(a_o->owner);
> +                     err = -EINVAL;
> +                     goto err_out;
>               }
>  
>               if (nla_memdup_cookie(a, tb) < 0) {
> -                     err = -ENOMEM;
>                       tcf_hash_release(a, bind);
> -                     goto err_mod;
> +                     if (err != ACT_P_CREATED)
> +                             module_put(a_o->owner);
> +                     err = -ENOMEM;
> +                     goto err_out;
>               }
>       }