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Message-ID: <75be710b-3eda-e077-7c90-beec059d83b2@gmail.com>
Date: Fri, 27 Jul 2018 11:00:25 +0900
From: Akihiro TSUKADA <tskd08@...il.com>
To: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: Colin Ian King <colin.king@...onical.com>,
linux-media@...r.kernel.org, Antti Palosaari <crope@....fi>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
mika.batsman@...il.com
Subject: Re: media: dvb-usb-v2/gl861: ensure USB message buffers DMA'able
Hi,
On 2018年07月25日 22:57, Mauro Carvalho Chehab wrote:
...
> There was another patch proposed to fix this issue with does the
> right thing when rlen == 0. I rebased it on the top of the current
> tree:
> https://git.linuxtv.org/media_tree.git/commit/?id=0b666e1c8120c0b17a8a68aaed58e22011f06ab3
>
> That should cover both cases.
When wlen is checked to be <= 2 and
wbuf[0],wbuf[1] are already used in 'index','value',
why this patch copys wbuf and passes it again in usb_control_msg when wo==1 ?
(just to silence static analiyzers?)
Furthermore,
I am afraid that a static analyzer might warn on a possible
buffer overrun in usb_control_msg in the case of rbuf == NULL && rlen > 2,
since buf's length is passed as rlen but is actually wlen.
regards,
Akihiro
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