From: Kees Cook Date: Wed, 12 Jan 2022 20:34:56 +0000 (-0800) Subject: iio: addac: ad74413r: Do not reference negative array offsets X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e7a3290d330e3f8cf06a3cad455c49e89183137b;p=linux.git iio: addac: ad74413r: Do not reference negative array offsets Instead of aiming rx_buf at an invalid array-boundary-crossing location, just skip the first increment. Seen when building with -Warray-bounds: drivers/iio/addac/ad74413r.c: In function 'ad74413r_update_scan_mode': drivers/iio/addac/ad74413r.c:843:22: warning: array subscript -4 is below array bounds of 'u8[16]' { aka 'unsigned char[16]'} [-Warray-bounds] 843 | u8 *rx_buf = &st->adc_samples_buf.rx_buf[-1 * AD74413R_FRAME_SIZE]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iio/addac/ad74413r.c:84:20: note: while referencing 'rx_buf' 84 | u8 rx_buf[AD74413R_FRAME_SIZE * AD74413R_CHANNEL_MAX]; | ^~~~~~ Cc: Lars-Peter Clausen Cc: Michael Hennerich Cc: Jonathan Cameron Cc: linux-iio@vger.kernel.org Fixes: fea251b6a5db ("iio: addac: add AD74413R driver") Reviewed-by: Cosmin Tanislav Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20220112203456.3950884-1-keescook@chromium.org Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/addac/ad74413r.c b/drivers/iio/addac/ad74413r.c index 5271073bb74e7..aba9a643a4ca7 100644 --- a/drivers/iio/addac/ad74413r.c +++ b/drivers/iio/addac/ad74413r.c @@ -840,7 +840,7 @@ static int ad74413r_update_scan_mode(struct iio_dev *indio_dev, { struct ad74413r_state *st = iio_priv(indio_dev); struct spi_transfer *xfer = st->adc_samples_xfer; - u8 *rx_buf = &st->adc_samples_buf.rx_buf[-1 * AD74413R_FRAME_SIZE]; + u8 *rx_buf = st->adc_samples_buf.rx_buf; u8 *tx_buf = st->adc_samples_tx_buf; unsigned int channel; int ret = -EINVAL; @@ -894,9 +894,10 @@ static int ad74413r_update_scan_mode(struct iio_dev *indio_dev, spi_message_add_tail(xfer, &st->adc_samples_msg); - xfer++; tx_buf += AD74413R_FRAME_SIZE; - rx_buf += AD74413R_FRAME_SIZE; + if (xfer != st->adc_samples_xfer) + rx_buf += AD74413R_FRAME_SIZE; + xfer++; } xfer->rx_buf = rx_buf;