linux-kernel - Re: BUG: NULL pointer dereference at ib_uverbs_comp

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Message-ID: <20170801192907.GB31205@obsidianresearch.com>
Date:   Tue, 1 Aug 2017 13:29:07 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Matan Barak <matanb@....mellanox.co.il>,
        Matan Barak <matanb@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Stephen Bates <sbates@...thlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Potnuri Bharat Teja <bharat@...lsio.com>
Subject: Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20

On Tue, Aug 01, 2017 at 12:32:57PM -0600, Logan Gunthorpe wrote:
>  Couldn't create rdma QP - Invalid argument
> Unable to create QP.
> Failed to create QP.

Failing to create a QP makes me wonder if you have have this patch?

 Subject: [PATCH v2 1/2] RDMA/uverbs: Fix the check for port number

 The port number is only valid if IB_QP_PORT is set in the mask.
 So only check port number if it is valid to prevent modify_qp from
 failing due to an invalid port number.

 Fixes: 5ecce4c9b17b("Check port number supplied by user verbs cmds")
 Cc: <stable@...r.kernel.org> # v2.6.14+
 Reviewed-by: Steve Wise <swise@...ngridcomputing.com>
 Signed-off-by: Mustafa Ismail <mustafa.ismail@...el.com>

Jason