linux-kernel - Re: [PATCH] lpfc: Fix possible use-after-free and double free in lpfc_mbx_cmpl_rdp_page

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Message-ID: <20150819002751.00000f06@localhost>
Date:	Wed, 19 Aug 2015 00:27:51 +0200
From:	Sebastian Herbszt <herbszt@....de>
To:	Johannes Thumshirn <jthumshirn@...e.de>,
	James Smart <james.smart@...gotech.com>,
	Dick Kennedy <dick.kennedy@...gotech.com>
Cc:	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Colin King <colin.king@...onical.com>,
	Sebastian Herbszt <herbszt@....de>
Subject: Re: [PATCH] lpfc: Fix possible use-after-free and double free in
 lpfc_mbx_cmpl_rdp_page_a2()

Johannes Thumshirn wrote:
> Sebastian Herbszt <herbszt@....de> writes:
> 
> > Johannes Thumshirn wrote:
> >> If the bf_get() call in lpfc_mbx_cmpl_rdp_page_a2() does succeeds, execution
> >> continues normally and mp gets kfree()d.
> >> 
> >> If the subsequent call to lpfc_sli_issue_mbox() fails execution jumps to the
> >> error label where lpfc_mbuf_free() is called with mp->virt and mp->phys as
> >> function arguments. This is the use after free. Following the use after free mp
> >> gets kfree()d again which is a double free.
> >
> > A similar patch was posted by Colin Ian King on 2015-07-31 [1].
> >
> > [1] http://marc.info/?l=linux-scsi&m=143835937206204&w=2
> 
> OK,
> 
> Is it already in James' tree (haven't checked)? The problematic code was
> merged for 4.2-rc1 so if the fix (Collin's or mine I don't care) could go
> in while we're still in the rc phase, we could avoid all that stable
> circus.
> 
> Thanks for digging this out.
> 
> Byte,
>         Johannes

It is not yet in scsi.git.

James S., Dick, which patch do you prefer?

Sebastian
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