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Message-ID: <5EE8178C.9090005@huawei.com>
Date: Tue, 16 Jun 2020 08:51:24 +0800
From: Jing Xiangfeng <jingxiangfeng@...wei.com>
To: Bart Van Assche <bvanassche@....org>, <dledford@...hat.com>,
<jgg@...pe.ca>
CC: <linux-rdma@...r.kernel.org>, <target-devel@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH] IB/srpt: Fix a potential null pointer dereference
On 2020/6/15 21:37, Bart Van Assche wrote:
> On 2020-06-15 02:12, Jing Xiangfeng wrote:
>> In srpt_cm_req_recv(), it is possible that sdev is NULL,
>> so we should test sdev before using it.
>>
>> Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
>> ---
>> drivers/infiniband/ulp/srpt/ib_srpt.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
>> index 98552749d71c..72053254bf84 100644
>> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
>> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
>> @@ -2143,7 +2143,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
>> const struct srp_login_req *req,
>> const char *src_addr)
>> {
>> - struct srpt_port *sport = &sdev->port[port_num - 1];
>> + struct srpt_port *sport;
>> struct srpt_nexus *nexus;
>> struct srp_login_rsp *rsp = NULL;
>> struct srp_login_rej *rej = NULL;
>> @@ -2162,6 +2162,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
>> if (WARN_ON(!sdev || !req))
>> return -EINVAL;
>>
>> + sport = &sdev->port[port_num - 1];
>> it_iu_len = be32_to_cpu(req->req_it_iu_len);
>>
>
> Please remove the (!sdev || !req) check instead of making the above
> change. It's easy to show that both pointers are always valid.
OK, I will send a v2 with this change.
Thanks
>
> Thanks,
>
> Bart.
> .
>
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