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iio: adc: ti-ads8688: fix information leak in triggered buffer

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commit 2a7377ccfd940cd6e9201756aff1e7852c266e69 upstream.

The 'buffer' local array is used to push data to user space from a
triggered buffer, but it does not set values for inactive channels, as
it only uses iio_for_each_active_channel() to assign new values.

Initialize the array to zero before using it to avoid pushing
uninitialized information to userspace.

Cc: stable@vger.kernel.org
Fixes: 61fa5dfa5f ("iio: adc: ti-ads8688: Fix alignment of buffer in iio_push_to_buffers_with_timestamp()")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241125-iio_memset_scan_holes-v1-8-0cb6e98d895c@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Javier Carrasco 2024-11-25 22:16:16 +01:00 committed by Greg Kroah-Hartman
parent 6985ba4467
commit ebe2672bc4
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/ti-ads8688.c
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@ -382,7 +382,7 @@ static irqreturn_t ads8688_trigger_handler(int irq, void *p)
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
/* Ensure naturally aligned timestamp */
u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)] __aligned(8);
u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)] __aligned(8) = { };
int i, j = 0;
for (i = 0; i < indio_dev->masklength; i++) {