linux-kernel - Re: [PATCH] ib_isert: prevent NULL pointer dereference in isert_login_recv

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Date:   Thu, 29 Jun 2017 08:36:51 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Andrea Righi <righi.andrea@...il.com>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:     Robert LeBlanc <robert@...lancnet.us>,
        Sean Jenkins <sean@...terservers.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        target-devel <target-devel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] ib_isert: prevent NULL pointer dereference in
 isert_login_recv_done()


> 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@...il.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");