tree ad50706c7cbf75a9302b6e244b22d93babb415c1
parent 9d90c1fd9bdbffb456d1b1ef05215343503fd0b0
author David Brownell <david-b@pacbell.net> 1192312591 +0200
committer Jean Delvare <khali@hyperion.delvare> 1192312591 +0200

i2c-dev: Reject I2C_M_RECV_LEN

The I2C_M_RECV_LEN calling convention for i2c_mesg.flags involves
playing games with reported buffer lengths.  (They start out less
than their actual size, and the length is then modified to reflect
how many bytes were delivered ... which one hopes is less than the
presumed actual size.)  Refuse to play such error prone games across
the boundary between userspace and kernel.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>