linux-kernel - Re: [PATCH for 3.4] virtio-scsi: fix TMF use-after-free

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Message-ID: <4F9F9A52.8010100@redhat.com>
Date:	Tue, 01 May 2012 10:09:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Hu Tao <hutao@...fujitsu.com>
Subject: Re: [PATCH for 3.4] virtio-scsi: fix TMF use-after-free

Il 18/04/2012 16:09, James Bottomley ha scritto:
>> > Fix a race in TMF path, where cmd may have been already freed
>> > by virtscsi_complete_free after waking up from the completion.
> There's no may about this; the command will be freed long before the
> completion waiter is awoken.  The description could be clearer.
> 
> The problem is a use after free in virtscsi_tmf because the
> virtio_scsi_command is freed before the completion returns.
> 
> The fix is to make callers specifying a completion responsible for
> freeing the command in all cases.

I don't see this in the pull request, were you waiting for v2 with a
better commit message?

Paolo
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