From: matthieu castet <castet.matthieu@free.fr>
Date: Wed, 20 May 2009 08:42:33 +0000 (-0300)
Subject: V4L/DVB (11832): dibusb_mc: fix i2c to not corrupt eeprom in case of strange read... 
X-Git-Tag: v2.6.31-rc1~297^2~162
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81dae6716f13e801cfe2035514e7aeb971b57492;p=pandora-kernel.git

V4L/DVB (11832): dibusb_mc: fix i2c to not corrupt eeprom in case of strange read pattern

dibusb_i2c_xfer seems to do things very dangerous :
it assumes that it get only write/read request or write request.

That means that read can be understood as write. For example a program
doing
file = open("/dev/i2c-x", O_RDWR);
    ioctl(file, I2C_SLAVE, 0x50)
read(file, data, 10)
    will corrupt the eeprom as it will be understood as a write.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

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