tree e7919ac09cbdb4d27ee04ae1e16b9c4f02fb6d99
parent 641b4bb5f1c51a68f5aec7d3b47c96b39820b105
author Lars-Peter Clausen <lars@metafoo.de> 1323678794 +0100
committer Greg Kroah-Hartman <gregkh@suse.de> 1323737463 -0800

staging:iio:kfifo_buf: Fix potential buffer overflow in iio_read_first_n_kfifo

n is the number of bytes to read, not the number of samples. So if there is
enough data available we will write to the userspace buffer beyond its bounds.
Fix this by copying n bytes maximum. Also round n down to the next multiple of
the sample size, so we will only read complete samples. If the buffer is too
small to hold at least one sample return -EINVAL.

Also update the documentation of read_first_n to reflect the fact that 'n' is
supposed to be in bytes and not in samples.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>