linux-kernel - Re: [PATCH] RDMA: hns: Fix possible null pointer dereference

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Message-ID: <1476bb96-c0a9-379a-546b-98fc8a06beea@hisilicon.com>
Date: Tue, 9 Apr 2024 19:10:21 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: Leon Romanovsky <leon@...nel.org>, Aleksandr Mishin <amishin@...rgos.ru>
CC: Wei Xu <xuwei5@...ilicon.com>, Chengchang Tang
	<tangchengchang@...wei.com>, Jason Gunthorpe <jgg@...pe.ca>, Xi Wang
	<wangxi11@...wei.com>, Shengming Shu <shushengming1@...wei.com>, Weihang Li
	<liweihang@...wei.com>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: Re: [PATCH] RDMA: hns: Fix possible null pointer dereference



On 2024/4/9 17:26, Leon Romanovsky wrote:
> On Tue, Apr 09, 2024 at 11:30:47AM +0300, Aleksandr Mishin wrote:
>> In hns_roce_hw_v2_get_cfg() pci_match_id() may return
>> NULL which is later dereferenced. Fix this bug by adding NULL check.
> 
> I don't know, this NULL can't happen in this flow.
> 
> Thanks
> 

Yeah, it's already checked here:

6911 static int hns_roce_hw_v2_init_instance(struct hnae3_handle *handle)
6912 {
6913         const struct hnae3_ae_ops *ops = handle->ae_algo->ops;
6914         const struct pci_device_id *id;
6915         struct device *dev = &handle->pdev->dev;
6916         int ret;
6917
6918         handle->rinfo.instance_state = HNS_ROCE_STATE_INIT;
6919
6920         if (ops->ae_dev_resetting(handle) || ops->get_hw_reset_stat(handle)) {
6921                 handle->rinfo.instance_state = HNS_ROCE_STATE_NON_INIT;
6922                 goto reset_chk_err;
6923         }
6924
6925         id = pci_match_id(hns_roce_hw_v2_pci_tbl, handle->pdev);
6926         if (!id)
6927                 return 0;
6928
6929         if (id->driver_data && handle->pdev->revision == PCI_REVISION_ID_HIP08)
6930                 return 0;
6931
6932         ret = __hns_roce_hw_v2_init_instance(handle);

Junxian

>>
>> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>>
>> Fixes: 0b567cde9d7a ("RDMA/hns: Enable RoCE on virtual functions")
>> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
>> ---
>>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 13 +++++++++++--
>>  1 file changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> index ba7ae792d279..31a2093334d9 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> @@ -6754,7 +6754,7 @@ static const struct pci_device_id hns_roce_hw_v2_pci_tbl[] = {
>>  
>>  MODULE_DEVICE_TABLE(pci, hns_roce_hw_v2_pci_tbl);
>>  
>> -static void hns_roce_hw_v2_get_cfg(struct hns_roce_dev *hr_dev,
>> +static int hns_roce_hw_v2_get_cfg(struct hns_roce_dev *hr_dev,
>>  				  struct hnae3_handle *handle)
>>  {
>>  	struct hns_roce_v2_priv *priv = hr_dev->priv;
>> @@ -6763,6 +6763,9 @@ static void hns_roce_hw_v2_get_cfg(struct hns_roce_dev *hr_dev,
>>  
>>  	hr_dev->pci_dev = handle->pdev;
>>  	id = pci_match_id(hns_roce_hw_v2_pci_tbl, hr_dev->pci_dev);
>> +	if (!id)
>> +		return -ENXIO;
>> +
>>  	hr_dev->is_vf = id->driver_data;
>>  	hr_dev->dev = &handle->pdev->dev;
>>  	hr_dev->hw = &hns_roce_hw_v2;
>> @@ -6789,6 +6792,8 @@ static void hns_roce_hw_v2_get_cfg(struct hns_roce_dev *hr_dev,
>>  
>>  	hr_dev->reset_cnt = handle->ae_algo->ops->ae_dev_reset_cnt(handle);
>>  	priv->handle = handle;
>> +
>> +	return 0;
>>  }
>>  
>>  static int __hns_roce_hw_v2_init_instance(struct hnae3_handle *handle)
>> @@ -6806,7 +6811,11 @@ static int __hns_roce_hw_v2_init_instance(struct hnae3_handle *handle)
>>  		goto error_failed_kzalloc;
>>  	}
>>  
>> -	hns_roce_hw_v2_get_cfg(hr_dev, handle);
>> +	ret = hns_roce_hw_v2_get_cfg(hr_dev, handle);
>> +	if (ret) {
>> +		dev_err(hr_dev->dev, "RoCE Engine cfg failed!\n");
>> +		goto error_failed_roce_init;
>> +	}
>>  
>>  	ret = hns_roce_init(hr_dev);
>>  	if (ret) {
>> -- 
>> 2.30.2
>>