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i2c-dev: Reject I2C_M_RECV_LEN
authorDavid Brownell <david-b@pacbell.net>
Sat, 13 Oct 2007 21:56:31 +0000 (23:56 +0200)
committerJean Delvare <khali@hyperion.delvare>
Sat, 13 Oct 2007 21:56:31 +0000 (23:56 +0200)
commite265cfa19c1220938de5f0291ed8d549a523de3c
treead50706c7cbf75a9302b6e244b22d93babb415c1tree | snapshot
parent9d90c1fd9bdbffb456d1b1ef05215343503fd0b0commit | diff
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>
drivers/i2c/i2c-dev.c diff | blob | history
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