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Re: [PATCH-for-6.0? v3] mptsas: Remove unused MPTSASState 'pending' fiel

From: Peter Maydell
Subject: Re: [PATCH-for-6.0? v3] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)
Date: Mon, 19 Apr 2021 17:47:13 +0100

On Mon, 19 Apr 2021 at 14:42, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
> From: Michael Tokarev <mjt@tls.msk.ru>
> While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
> the Megaraid emulator appends new MPTSASRequest object 'req' to
> the 's->pending' queue. In case of an error, this same object gets
> dequeued in mptsas_free_request() only if SCSIRequest object
> 'req->sreq' is initialised. This may lead to a use-after-free issue.
> Since s->pending is actually not used, simply remove it from
> MPTSASState.
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Message-Id: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
> BugLink: https://bugs.launchpad.net/qemu/+bug/1914236 (CVE-2021-3392)
> Fixes: e351b826112 ("hw: Add support for LSI SAS1068 (mptsas) device")
> [PMD: Reworded description, added more tags]
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> v3: Remove now unused variable in mptsas_free_request (pm215)
> MJT patch:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg799236.html
> Since rc4 is soon, I'm directly respining his patch with my comments
> addressed.
> This is not a new regression (present since QEMU v2.6.0) but is a
> CVE...
> PJP first patch:
> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg02660.html

This is clearly-safe and since it's marked as a CVE and we're doing
rc4 anyway we might as well put it in. Applied to master, thanks.

-- PMM

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