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iio: dummy: iio_simply_dummy_buffer: fix information leak in triggered buffer

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commit 333be433ee908a53f283beb95585dfc14c8ffb46 upstream.

The 'data' array is allocated via kmalloc() and it 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.

Use kzalloc for the memory allocation to avoid pushing uninitialized
information to userspace.

Cc: stable@vger.kernel.org
Fixes: 415f792447 ("iio: Move IIO Dummy Driver out of staging")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241125-iio_memset_scan_holes-v1-9-0cb6e98d895c@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 22:16:17 +01:00 committed by Greg Kroah-Hartman
parent b7849f62e6
commit b0642d9c87
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/dummy/iio_simple_dummy_buffer.c
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@ -48,7 +48,7 @@ static irqreturn_t iio_simple_dummy_trigger_h(int irq, void *p)
int i = 0, j;
u16 *data;
data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
data = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (!data)
goto done;