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

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Message-ID: <1a96d3be-cc40-4aef-bd4d-bb3a9ef3a7d4@t-argos.ru>
Date: Tue, 9 Apr 2024 21:01:38 +0300
From: Aleksandr Mishin <amishin@...rgos.ru>
To: Junxian Huang <huangjunxian6@...ilicon.com>, Leon Romanovsky
	<leon@...nel.org>
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


Thank you! I assumed something like this, but I couldn't find any 
confirmations and offered a patch as a solution.

On 09.04.2024 14:10, Junxian Huang wrote:
> 
> 
> 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
>>>
> 

-- 
Kind regards
Aleksandr