From: Antoniu Miclaus Date: Fri, 9 May 2025 10:16:57 +0000 (+0300) Subject: iio: adc: ad4851: fix ad4858 chan pointer handling X-Git-Tag: v6.16-rc1~30^2~35^2~3 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=499a8cee812588905cc940837e69918c1649a19e;p=thirdparty%2Flinux.git iio: adc: ad4851: fix ad4858 chan pointer handling The pointer returned from ad4851_parse_channels_common() is incremented internally as each channel is populated. In ad4858_parse_channels(), the same pointer was further incremented while setting ext_scan_type fields for each channel. This resulted in indio_dev->channels being set to a pointer past the end of the allocated array, potentially causing memory corruption or undefined behavior. Fix this by iterating over the channels using an explicit index instead of incrementing the pointer. This preserves the original base pointer and ensures all channel metadata is set correctly. Fixes: 6250803fe2ec ("iio: adc: ad4851: add ad485x driver") Signed-off-by: Antoniu Miclaus Reviewed-by: Nuno Sá Link: https://patch.msgid.link/20250509101657.6742-1-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/ad4851.c b/drivers/iio/adc/ad4851.c index 98ebc853db796..f1d2e2896f2a2 100644 --- a/drivers/iio/adc/ad4851.c +++ b/drivers/iio/adc/ad4851.c @@ -1034,7 +1034,7 @@ static int ad4858_parse_channels(struct iio_dev *indio_dev) struct device *dev = &st->spi->dev; struct iio_chan_spec *ad4851_channels; const struct iio_chan_spec ad4851_chan = AD4858_IIO_CHANNEL; - int ret; + int ret, i = 0; ret = ad4851_parse_channels_common(indio_dev, &ad4851_channels, ad4851_chan); @@ -1042,15 +1042,15 @@ static int ad4858_parse_channels(struct iio_dev *indio_dev) return ret; device_for_each_child_node_scoped(dev, child) { - ad4851_channels->has_ext_scan_type = 1; + ad4851_channels[i].has_ext_scan_type = 1; if (fwnode_property_read_bool(child, "bipolar")) { - ad4851_channels->ext_scan_type = ad4851_scan_type_20_b; - ad4851_channels->num_ext_scan_type = ARRAY_SIZE(ad4851_scan_type_20_b); + ad4851_channels[i].ext_scan_type = ad4851_scan_type_20_b; + ad4851_channels[i].num_ext_scan_type = ARRAY_SIZE(ad4851_scan_type_20_b); } else { - ad4851_channels->ext_scan_type = ad4851_scan_type_20_u; - ad4851_channels->num_ext_scan_type = ARRAY_SIZE(ad4851_scan_type_20_u); + ad4851_channels[i].ext_scan_type = ad4851_scan_type_20_u; + ad4851_channels[i].num_ext_scan_type = ARRAY_SIZE(ad4851_scan_type_20_u); } - ad4851_channels++; + i++; } indio_dev->channels = ad4851_channels;