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Subject: Re: [PATCH v2] libata: zpodd: Fix small read overflow in
 zpodd_get_mech_type()
To:     Kees Cook <keescook@chromium.org>
Cc:     Jeffrin Jose T <jeffrin@rajagiritech.edu.in>,
        linux-kernel@vger.kernel.org,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        tobin@kernel.org, Dmitry Vyukov <dvyukov@google.com>,
        Alexander Potapenko <glider@google.com>,
        Tejun Heo <tj@kernel.org>
References: <201907291442.B9953EBED@keescook>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <3e515b31-0779-4f65-debf-49e462f9cd25@kernel.dk>
Date:   Mon, 29 Jul 2019 15:55:40 -0600
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On 7/29/19 3:47 PM, Kees Cook wrote:
> Jeffrin reported a KASAN issue:
> 
>    BUG: KASAN: global-out-of-bounds in ata_exec_internal_sg+0x50f/0xc70
>    Read of size 16 at addr ffffffff91f41f80 by task scsi_eh_1/149
>    ...
>    The buggy address belongs to the variable:
>      cdb.48319+0x0/0x40
> 
> Much like commit 18c9a99bce2a ("libata: zpodd: small read overflow in
> eject_tray()"), this fixes a cdb[] buffer length, this time in
> zpodd_get_mech_type():
> 
> We read from the cdb[] buffer in ata_exec_internal_sg(). It has to be
> ATAPI_CDB_LEN (16) bytes long, but this buffer is only 12 bytes.

Applied, thanks.

-- 
Jens Axboe