linux-kernel - Re: [PATCH] drivers/scsi/qla2xxx: fix double free bug after firmware timeout

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Date:   Thu, 18 Jan 2018 01:02:30 +0000
From:   "Madhani, Himanshu" <Himanshu.Madhani@...ium.com>
To:     Max Kellermann <mk@...all.com>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Dept-Eng QLA2xxx Upstream <qla2xxx-upstream@...ium.com>,
        "max.kellermann@...il.com" <max.kellermann@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/scsi/qla2xxx: fix double free bug after firmware
 timeout

Max,

> On Jan 15, 2018, at 12:37 PM, Max Kellermann <mk@...all.com> wrote:
> 
> On 2018/01/15 20:58, "Madhani, Himanshu" <Himanshu.Madhani@...ium.com> wrote:
>> We have patch to prevent this double free in 4.16/scsi-queue
>> already.
> 
> No, let me repeat: this is a different bug!
> 
> Your bug is about the free call after waiting for completion
> synchronously in qla24xx_els_dcmd_iocb(), after it was already freed
> by qla2x00_sp_timeout().
> 
> My bug is about free in qla2x00_*_sp_done() and again in
> qla2x00_sp_timeout().  My patch description describes exactly that.
> 
> And you know what?  My patch fixes both bugs.  It is superior to the
> one that was merged 4 weeks later, isn't it?
> 
> You NACKed my patch 5 weeks ago, and I explained to you that you were
> talking about a different bug, but you never replied to that.
> 
> Max

Just to update you, we are working on fixing this internally and will post
patch soon. 

I’ll add you are Reporter and please review and let us know your comments.

Thanks,
- Himanshu