Re: [PATCH] lib: add warning for NULL pointer

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed,  5 Dec 2018 19:55:31 +0800
Qiming Yang <qiming.yang@intel.com> wrote:

> May return NULL when manage tries for packet in acl library. So
> this patch added warning for the NULL pointer return.
> 
> Fixes: 074f54ad03ee ("acl: fix build and runtime for default target")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Qiming Yang <qiming.yang@intel.com>
> ---
>  lib/librte_acl/acl_run.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/librte_acl/acl_run.h b/lib/librte_acl/acl_run.h
> index bf7842d..6c718c0 100644
> --- a/lib/librte_acl/acl_run.h
> +++ b/lib/librte_acl/acl_run.h
> @@ -143,6 +143,9 @@ acl_start_next_trie(struct acl_flow_data *flows, struct parms *parms, int n,
>  				flows->num_packets * flows->categories);
>  		}
>  
> +		if (flows->last_cmplt == NULL)
> +			RTE_LOG(WARNING, MALLOC, "packet tries allocate failed");
> +
>  		/* set completion parameters and starting index for this slot */
>  		parms[n].cmplt = flows->last_cmplt;
>  		transition =

It would be better to return -ENOMEM and let caller handle the error.