On 4/19/21 3:32 PM, Peter Maydell wrote:
> On Sun, 18 Apr 2021 at 06:30, Philippe Mathieu-Daudé <phi...@redhat.com> 
> wrote:
>>
>> From: Michael Tokarev <m...@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-sta...@nongnu.org
>> Signed-off-by: Michael Tokarev <m...@tls.msk.ru>
>> Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
>> Message-Id: <20210416102243.1293871-1-...@msgid.tls.msk.ru>
>> Reported-by: Cheolwoo Myung <cwmy...@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 <phi...@redhat.com>
>> ---
>> Supersedes: <20210416102243.1293871-1-...@msgid.tls.msk.ru>
>>
>> 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
>> ---
>>  hw/scsi/mptsas.h | 1 -
>>  hw/scsi/mptsas.c | 4 ----
>>  2 files changed, 5 deletions(-)
> 
> This fails to compile:
> 
> ../../hw/scsi/mptsas.c: In function ‘mptsas_free_request’:
> ../../hw/scsi/mptsas.c:254:18: error: unused variable ‘s’
> [-Werror=unused-variable]
>      MPTSASState *s = req->dev;
>                   ^
> cc1: all warnings being treated as errors

What a shame... Sorry, v3 coming.


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