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

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Date:	Mon, 17 Aug 2015 23:26:34 +0200
From:	Sebastian Herbszt <herbszt@....de>
To:	Johannes Thumshirn <jthumshirn@...e.de>
Cc:	James Smart <james.smart@...gotech.com>,
	Dick Kennedy <dick.kennedy@...gotech.com>,
	"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:
> 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

Sebastian
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