tree df934098d2d534d121b2afb1f64ec9cf994a65b2
parent 9225c0b7b976dd9ceac2b80727a60d8fcb906a62
author Lars-Peter Clausen <lars@metafoo.de> 1448632556 +0100
committer Jonathan Cameron <jic23@kernel.org> 1449336724 +0000

iio: adis_buffer: Fix out-of-bounds memory access

The SPI tx and rx buffers are both supposed to be scan_bytes amount of
bytes large and a common allocation is used to allocate both buffers. This
puts the beginning of the tx buffer scan_bytes bytes after the rx buffer.
The initialization of the tx buffer pointer is done adding scan_bytes to
the beginning of the rx buffer, but since the rx buffer is of type __be16
this will actually add two times as much and the tx buffer ends up pointing
after the allocated buffer.

Fix this by using scan_count, which is scan_bytes / 2, instead of
scan_bytes when initializing the tx buffer pointer.

Fixes: aacff892cbd5 ("staging:iio:adis: Preallocate transfer message")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>