From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ye Xiaolong <xiaolong.ye@intel.com>
Subject: Re: [PATCH 3/3] vhost: fix null pointer checking
Date: Thu, 4 Apr 2019 14:47:24 +0800
Message-ID: <20190404064724.GA33544@intel.com>
References: <20190403160823.1337-1-mohammad.abdul.awal@intel.com>
 <20190404060354.GA5423@dpdk-tbie.sh.intel.com>
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Cc: Mohammad Abdul Awal <mohammad.abdul.awal@intel.com>, dev@dpdk.org,
 maxime.coquelin@redhat.com, zhihong.wang@intel.com, stable@dpdk.org
To: Tiwei Bie <tiwei.bie@intel.com>
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Hi, Tiwei,

On 04/04, Tiwei Bie wrote:
[snip]
>> @@ -515,7 +515,7 @@ rte_vhost_get_ifname(int vid, char *buf, size_t len)
>>  {
>>  	struct virtio_net *dev = get_device(vid);
>>  
>> -	if (dev == NULL)
>> +	if (dev == NULL || !buf)
>
>It would be better to do the check in this way: (!dev || !buf)
>for consistency.
>

According to DPDK coding conventions 1.8.1 on NULL pointers [1], shouldn't it be

if (dev == NULL || buf == NULL)?

[1] https://doc.dpdk.org/guides/contributing/coding_style.html#null-pointers

Thanks,
Xiaolong
>Thanks for the work!
>Tiwei
>
>
>>  		return -1;
>>  
>>  	len = RTE_MIN(len, sizeof(dev->ifname));
>> @@ -532,7 +532,7 @@ rte_vhost_get_negotiated_features(int vid, uint64_t *features)
>>  	struct virtio_net *dev;
>>  
>>  	dev = get_device(vid);
>> -	if (!dev)
>> +	if (!dev || !features)
>>  		return -1;
>>  
>>  	*features = dev->features;
>> @@ -547,7 +547,7 @@ rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
>>  	size_t size;
>>  
>>  	dev = get_device(vid);
>> -	if (!dev)
>> +	if (!dev || !mem)
>>  		return -1;
>>  
>>  	size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
>> @@ -570,7 +570,7 @@ rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
>>  	struct vhost_virtqueue *vq;
>>  
>>  	dev = get_device(vid);
>> -	if (!dev)
>> +	if (!dev || !vring)
>>  		return -1;
>>  
>>  	if (vring_idx >= VHOST_MAX_VRING)
>> @@ -763,7 +763,7 @@ int rte_vhost_get_log_base(int vid, uint64_t *log_base,
>>  {
>>  	struct virtio_net *dev = get_device(vid);
>>  
>> -	if (!dev)
>> +	if (!dev || !log_base || !log_size)
>>  		return -1;
>>  
>>  	*log_base = dev->log_base;
>> @@ -777,7 +777,7 @@ int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
>>  {
>>  	struct virtio_net *dev = get_device(vid);
>>  
>> -	if (!dev)
>> +	if (!dev || !last_avail_idx || !last_used_idx)
>>  		return -1;
>>  
>>  	*last_avail_idx = dev->virtqueue[queue_id]->last_avail_idx;
>> @@ -805,7 +805,7 @@ int rte_vhost_extern_callback_register(int vid,
>>  {
>>  	struct virtio_net *dev = get_device(vid);
>>  
>> -	if (!dev)
>> +	if (!dev || !ops)
>>  		return -1;
>>  
>>  	dev->extern_ops = *ops;
>> -- 
>> 2.17.1
>>