Re: [PATCH v5] af_packet: Fix some klocwork errors

["John W. Linville" <linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>]

On Mon, Mar 09, 2015 at 04:58:11PM +0800, Ouyang Changchun wrote:
> Fix possible memory leak issue: free kvlist before return;
> Fix possible resource lost issue: close qssockfd before return;
> 
> Signed-off-by: Changchun Ouyang <changchun.ouyang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
> Change in v5:
>   - Initialize qsockfd with -1;
> 
> Change in v4:
>   - Check sockfd in internals->rx_queue against 0.
>  
> Change in v3:
>   - Also close sockets for all queues.
>  
> Change in v2:
>   - Make the error exit point a common path.
> 
>  lib/librte_pmd_af_packet/rte_eth_af_packet.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_pmd_af_packet/rte_eth_af_packet.c b/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> index 80e9bdf..2a27ebc 100644
> --- a/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> +++ b/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> @@ -442,7 +442,8 @@ rte_pmd_init_internals(const char *name,
>  	struct tpacket_req *req;
>  	struct pkt_rx_queue *rx_queue;
>  	struct pkt_tx_queue *tx_queue;
> -	int rc, qsockfd, tpver, discard;
> +	int rc, tpver, discard;
> +	int qsockfd = -1;
>  	unsigned int i, q, rdsize;
>  	int fanout_arg __rte_unused, bypass __rte_unused;
>  
> @@ -691,9 +692,14 @@ error:
>  				rte_free((*internals)->rx_queue[q].rd);
>  			if ((*internals)->tx_queue[q].rd)
>  				rte_free((*internals)->tx_queue[q].rd);
> +			if (((*internals)->rx_queue[q].sockfd != 0) &&
> +				((*internals)->rx_queue[q].sockfd != qsockfd))
> +				close((*internals)->rx_queue[q].sockfd);
>  		}
>  		rte_free(*internals);
>  	}
> +	if (qsockfd != -1)
> +		close(qsockfd);
>  	return -1;
>  }
>  

The part above seems fine.

> @@ -823,16 +829,21 @@ rte_pmd_af_packet_devinit(const char *name, const char *params)
>  		ret = rte_kvargs_process(kvlist, ETH_AF_PACKET_IFACE_ARG,
>  		                         &open_packet_iface, &sockfd);
>  		if (ret < 0)
> -			return -1;
> +			goto error;
>  	}
>  
>  	ret = rte_eth_from_packet(name, &sockfd, numa_node, kvlist);
>  	close(sockfd); /* no longer needed */
>  
>  	if (ret < 0)
> -		return -1;
> +		goto error;
>  
> +	rte_kvargs_free(kvlist);
>  	return 0;
> +
> +error:
> +	rte_kvargs_free(kvlist);
> +	return -1;
>  }
>  
>  static struct rte_driver pmd_af_packet_drv = {

This seems a bit awkward.  How about the following?

@@ -823,16 +829,15 @@ rte_pmd_af_packet_devinit(const char *name, const char *params)
 		ret = rte_kvargs_process(kvlist, ETH_AF_PACKET_IFACE_ARG,
 		                         &open_packet_iface, &sockfd);
 		if (ret < 0)
-			return -1;
+			goto exit;
 	}
 
 	ret = rte_eth_from_packet(name, &sockfd, numa_node, kvlist);
 	close(sockfd); /* no longer needed */
 
-	if (ret < 0)
-		return -1;
-
-	return 0;
+exit:
+	rte_kvargs_free(kvlist);
+	return ret;
 }
 
 static struct rte_driver pmd_af_packet_drv = {

Does this seem OK to you?

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org			might be all we have.  Be ready.