Re: [dpdk-dev] [PATCH 1/2] raw/ntb: check spad user index

["Min Hu (Connor)" <humin29@huawei.com>]

Hi, xiaoyun,

在 2021/4/21 11:31, Li, Xiaoyun 写道:
> Hi
> 
>> -----Original Message-----
>> From: Min Hu (Connor) <humin29@huawei.com>
>> Sent: Wednesday, April 21, 2021 10:08
>> To: dev@dpdk.org
>> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Li, Xiaoyun <xiaoyun.li@intel.com>;
>> Wu, Jingjing <jingjing.wu@intel.com>
>> Subject: [PATCH 1/2] raw/ntb: check spad user index
>>
>> From: Chengwen Feng <fengchengwen@huawei.com>
>>
>> This patch adds checking spad user index validity when set or get attr.
>>
>> Fixes: 277310027965 ("raw/ntb: introduce NTB raw device driver")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
>> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
>> ---
>>   drivers/raw/ntb/ntb.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/raw/ntb/ntb.c b/drivers/raw/ntb/ntb.c index
>> 6dd213e..0f0e3f2 100644
>> --- a/drivers/raw/ntb/ntb.c
>> +++ b/drivers/raw/ntb/ntb.c
>> @@ -1080,6 +1080,10 @@ ntb_attr_set(struct rte_rawdev *dev, const char
>> *attr_name,
>>   		if (hw->ntb_ops->spad_write == NULL)
>>   			return -ENOTSUP;
>>   		index = atoi(&attr_name[NTB_SPAD_USER_LEN]);
>> +		if (index < 0 || index >= NTB_SPAD_USER_MAX_NUM) {
>> +			NTB_LOG(ERR, "Invalid attribute (%s)", attr_name);
>> +			return -EINVAL;
>> +		}
> 
> It's unnecessary. The value will be checked in intel_ntb_spad_write(). There will be error remind in that.
>
Nothing to do with intel_ntb_spad_write. If index is no checked,
hw->spad_user_list[index] may be be out of memory and result in
segmentation default.

	
>>   		(*hw->ntb_ops->spad_write)(dev, hw->spad_user_list[index],
>>   					   1, attr_value);
>>   		NTB_LOG(DEBUG, "Set attribute (%s) Value (%" PRIu64 ")", @@
>> -1174,6 +1178,10 @@ ntb_attr_get(struct rte_rawdev *dev, const char
>> *attr_name,
>>   		if (hw->ntb_ops->spad_read == NULL)
>>   			return -ENOTSUP;
>>   		index = atoi(&attr_name[NTB_SPAD_USER_LEN]);
>> +		if (index < 0 || index >= NTB_SPAD_USER_MAX_NUM) {
>> +			NTB_LOG(ERR, "Attribute (%s) out of range",
>> attr_name);
>> +			return -EINVAL;
>> +		}
> 
> Same as above.
> 
>>   		*attr_value = (*hw->ntb_ops->spad_read)(dev,
>>   				hw->spad_user_list[index], 0);
>>   		NTB_LOG(DEBUG, "Attribute (%s) Value (%" PRIu64 ")",
>> --
>> 2.7.4
> 
> .
>