From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Subject: Re: [PATCH] eal: Add the check for null peer pointer in
 mp request handler
Date: Mon, 10 Dec 2018 16:41:35 +0000
Message-ID: <23a41184-d366-ca83-4815-143ac350735e@intel.com>
References: <1543990764-32140-1-git-send-email-gfree.wind@vip.163.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Gao Feng <davidfgao@tencent.com>
To: gfree.wind@vip.163.com, dev@dpdk.org
Return-path: <dev-bounces@dpdk.org>
Received: from mga03.intel.com (mga03.intel.com [134.134.136.65])
 by dpdk.org (Postfix) with ESMTP id C13A51B1F4
 for <dev@dpdk.org>; Mon, 10 Dec 2018 17:41:38 +0100 (CET)
In-Reply-To: <1543990764-32140-1-git-send-email-gfree.wind@vip.163.com>
Content-Language: en-US
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

On 05-Dec-18 6:19 AM, gfree.wind@vip.163.com wrote:
> From: Gao Feng <davidfgao@tencent.com>
> 
> Add the check for null peer pointer like the bundle pointer in the mp request
> handler. They should follow same style. And add some logs for nomem cases.
> 
> Signed-off-by: Gao Feng <davidfgao@tencent.com>
> ---
>   lib/librte_eal/common/hotplug_mp.c | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
> 
> diff --git a/lib/librte_eal/common/hotplug_mp.c b/lib/librte_eal/common/hotplug_mp.c
> index 070e2e0..0d2996f 100644
> --- a/lib/librte_eal/common/hotplug_mp.c
> +++ b/lib/librte_eal/common/hotplug_mp.c
> @@ -200,6 +200,11 @@ static int cmp_dev_name(const struct rte_device *dev, const void *_name)
>   	 * when it is ready.
>   	 */
>   	bundle->peer = strdup(peer);
> +	if (bundle->peer == NULL) {
> +		free(bundle);
> +		RTE_LOG(ERR, EAL, "not enough memory\n");

The error should probably be more descriptive (as in, it should be 
easier to identify where it came from). Suggested rewording:

"hotplug: cannot allocate memory for bundle"

or something along those lines. Same for other log messages.

As for actual code,

Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>


> +		return send_response_to_secondary(req, -ENOMEM, peer);
> +	}
>   
>   	/**
>   	 * We are at IPC callback thread, sync IPC is not allowed due to
> @@ -311,6 +316,7 @@ static void __handle_primary_request(void *param)
>   
>   	bundle = calloc(1, sizeof(*bundle));
>   	if (bundle == NULL) {
> +		RTE_LOG(ERR, EAL, "not enough memory\n"); >   		resp->result = -ENOMEM;
>   		ret = rte_mp_reply(&mp_resp, peer);
>   		if (ret)
> @@ -325,6 +331,15 @@ static void __handle_primary_request(void *param)
>   	 * when it is ready.
>   	 */
>   	bundle->peer = (void *)strdup(peer);
> +	if (bundle->peer == NULL) {
> +		RTE_LOG(ERR, EAL, "not enough memory\n");
> +		free(bundle);
> +		resp->result = -ENOMEM;
> +		ret = rte_mp_reply(&mp_resp, peer);
> +		if (ret)
> +			RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
> +		return ret;
> +	}
>   
>   	/**
>   	 * We are at IPC callback thread, sync IPC is not allowed due to
> 


-- 
Thanks,
Anatoly