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iio: Fix scan mask selection
The trialmask is expected to have all bits set to 0 after allocation.
Currently kmalloc_array() is used which does not zero the memory and so
random bits are set. This results in random channels being enabled when
they shouldn't. Replace kmalloc_array() with kcalloc() which has the same
interface but zeros the memory.
Note the fix is actually required earlier than the below fixes tag, but
will require a manual backport due to move from kmalloc to kmalloc_array.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Fixes commit 057ac1acdf
("iio: Use kmalloc_array() in iio_scan_mask_set()").
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
parent
7ce0f21622
commit
20ea39ef9f
1 changed files with 2 additions and 3 deletions
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@ -320,9 +320,8 @@ static int iio_scan_mask_set(struct iio_dev *indio_dev,
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const unsigned long *mask;
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unsigned long *trialmask;
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trialmask = kmalloc_array(BITS_TO_LONGS(indio_dev->masklength),
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sizeof(*trialmask),
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GFP_KERNEL);
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trialmask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
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sizeof(*trialmask), GFP_KERNEL);
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if (trialmask == NULL)
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return -ENOMEM;
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if (!indio_dev->masklength) {
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