Subject: Re: [PATCH] ib_isert: prevent NULL pointer dereference in
 isert_login_recv_done()
To: Andrea Righi <righi.andrea@gmail.com>,
        "Nicholas A. Bellinger" <nab@linux-iscsi.org>
Cc: Robert LeBlanc <robert@leblancnet.us>,
        Sean Jenkins <sean@betterservers.com>,
        Doug Ledford <dledford@redhat.com>, Sean Hefty <sean.hefty@intel.com>,
        Hal Rosenstock <hal.rosenstock@gmail.com>,
        linux-rdma <linux-rdma@vger.kernel.org>,
        target-devel <target-devel@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@lst.de>
References: <CAANLjFoaZ8ueEQet3Yu6LygmxXBbQ0cHUEYsb2xEON0o3N9=+w@mail.gmail.com>
 <CAANLjFp6Y8wvLvmWrk1ECjm-OoyEppxD1svNYKpg+HDEZevJig@mail.gmail.com>
 <CAANLjFoQcmfkjq9N1fehTC9Zi6aOC7ArOEPXz-he3EnOvWeEDw@mail.gmail.com>
 <20170622223757.GC28955@Dell>
 <1498435084.26123.66.camel@haakon3.risingtidesystems.com>
 <20170628175354.GB1769@Dell>
From: Sagi Grimberg <sagi@grimberg.me>
Message-ID: <ac404f71-3f34-af4c-b7b2-2b19ae768f47@grimberg.me>
Date: Thu, 29 Jun 2017 08:36:51 +0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.1.1
MIME-Version: 1.0
In-Reply-To: <20170628175354.GB1769@Dell>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 613
Lines: 17


> Just tested this patch, I wasn't able to reproduce the NULL pointer
> dereference or any other bugs, so this fix seems safe enough to me.
> 
> Tested-by: Andrea Righi <righi.andrea@gmail.com>

Can you test just the one liner fix below?

>> @@ -1452,7 +1452,7 @@
>>   isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
>>   {
>>   	struct isert_conn *isert_conn = wc->qp->qp_context;
>> -	struct ib_device *ib_dev = isert_conn->cm_id->device;
>> +	struct ib_device *ib_dev = isert_conn->device->ib_device;
>>   
>>   	if (unlikely(wc->status != IB_WC_SUCCESS)) {
>>   		isert_print_wc(wc, "login recv");