linux-kernel - Re: [PATCH 3.10 199/319] IB/srpt: Simplify srpt_handle_tsk

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Date:   Mon, 6 Feb 2017 05:14:04 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "w@....eu" <w@....eu>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     "sagig@...lanox.com" <sagig@...lanox.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "nab@...ux-iscsi.org" <nab@...ux-iscsi.org>
Subject: Re: [PATCH 3.10 199/319] IB/srpt: Simplify srpt_handle_tsk_mgmt()

On Sun, 2017-02-05 at 20:20 +0100, Willy Tarreau wrote:
> From: Bart Van Assche <bart.vanassche@...disk.com>
> 
> commit 51093254bf879bc9ce96590400a87897c7498463 upstream.
> 
> Let the target core check task existence instead of the SRP target
> driver. Additionally, let the target core check the validity of the
> task management request instead of the ib_srpt driver.
> 
> This patch fixes the following kernel crash:
> 
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
> IP: [<ffffffffa0565f37>] srpt_handle_new_iu+0x6d7/0x790 [ib_srpt]
> Oops: 0002 [#1] SMP
> Call Trace:
>  [<ffffffffa05660ce>] srpt_process_completion+0xde/0x570 [ib_srpt]
>  [<ffffffffa056669f>] srpt_compl_thread+0x13f/0x160 [ib_srpt]
>  [<ffffffff8109726f>] kthread+0xcf/0xe0
>  [<ffffffff81613cfc>] ret_from_fork+0x7c/0xb0

Hi Willy,

The first part of the description of this patch is correct (the part about
the refactoring) but the second part not (about the kernel crash). If you
are looking only for patches that fix bugs you may want to skip this patch.

Bart.