tools: iio: iio_generic_buffer ensure alignment
authorMatti Vaittinen <mazziesaccount@gmail.com>
Tue, 3 Oct 2023 09:57:47 +0000 (12:57 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 20 Nov 2023 10:52:10 +0000 (11:52 +0100)
commitdae6fd97477359c5513d84816814ffd5802bfc8b
tree1f1dd014350a507bc540bd1a32002bd206b99dde
parent06a1286345ac01fc762fe5f863bfca4bee93c497
tools: iio: iio_generic_buffer ensure alignment

[ Upstream commit 2d3dff577dd0ea8fe9637a13822f7603c4a881c8 ]

The iio_generic_buffer can return garbage values when the total size of
scan data is not a multiple of the largest element in the scan. This can be
demonstrated by reading a scan, consisting, for example of one 4-byte and
one 2-byte element, where the 4-byte element is first in the buffer.

The IIO generic buffer code does not take into account the last two
padding bytes that are needed to ensure that the 4-byte data for next
scan is correctly aligned.

Add the padding bytes required to align the next sample with the scan size.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Fixes: e58537ccce73 ("staging: iio: update example application.")
Link: https://lore.kernel.org/r/ZRvlm4ktNLu+qmlf@dc78bmyyyyyyyyyyyyydt-3.rev.dnainternet.fi
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
tools/iio/iio_generic_buffer.c