KVM Archive on lore.kernel.org
 help / color / Atom feed
From: Paul Mackerras <paulus@ozlabs.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: linuxppc-dev@lists.ozlabs.org,
	David Gibson <david@gibson.dropbear.id.au>,
	kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
	Jose Ricardo Ziviani <joserz@linux.ibm.com>,
	Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [PATCH kernel] vfio/spapr_tce: Fix incorrect tce_iommu_group memory free
Date: Fri, 23 Aug 2019 15:32:41 +1000
Message-ID: <20190823053241.hogc44em2ccwdwq4@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <20190819015117.94878-1-aik@ozlabs.ru>

On Mon, Aug 19, 2019 at 11:51:17AM +1000, Alexey Kardashevskiy wrote:
> The @tcegrp variable is used in 1) a loop over attached groups
> 2) it stores a pointer to a newly allocated tce_iommu_group if 1) found
> nothing. However the error handler does not distinguish how we got there
> and incorrectly releases memory for a found+incompatible group.
> This fixes it by adding another error handling case.
> Fixes: 0bd971676e68 ("powerpc/powernv/npu: Add compound IOMMU groups")
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Good catch.  This is potentially nasty since it is a double free.
Alex, are you going to take this, or would you prefer it goes via
Michael Ellerman's tree?

Reviewed-by: Paul Mackerras <paulus@ozlabs.org>

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19  1:51 Alexey Kardashevskiy
2019-08-23  5:32 ` Paul Mackerras [this message]
2019-08-23 14:40   ` Alex Williamson
2019-08-23 20:44 ` Alex Williamson

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190823053241.hogc44em2ccwdwq4@oak.ozlabs.ibm.com \
    --to=paulus@ozlabs.org \
    --cc=aik@ozlabs.ru \
    --cc=alex.williamson@redhat.com \
    --cc=david@gibson.dropbear.id.au \
    --cc=joserz@linux.ibm.com \
    --cc=kvm-ppc@vger.kernel.org \
    --cc=kvm@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

KVM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/kvm/0 kvm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kvm kvm/ https://lore.kernel.org/kvm \
	public-inbox-index kvm

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git