From 8cbe65a685978539dfc2cce0afbccfdc7d618020 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 20 Feb 2019 17:11:32 +0200 Subject: [PATCH] iio: Fix scan mask selection commit 20ea39ef9f2f911bd01c69519e7d69cfec79fde3 upstream. 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 Signed-off-by: Alexandru Ardelean Fixes commit 057ac1acdfc4 ("iio: Use kmalloc_array() in iio_scan_mask_set()"). Signed-off-by: Jonathan Cameron Signed-off-by: Ben Hutchings Change-Id: I309752003d76b0b586009ee1524779af8e63b87e --- drivers/iio/industrialio-buffer.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 29fa1ce6aa71..a4fdca4150d8 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -719,9 +719,8 @@ int iio_scan_mask_set(struct iio_dev *indio_dev, const unsigned long *mask; unsigned long *trialmask; - trialmask = kmalloc_array(BITS_TO_LONGS(indio_dev->masklength), - sizeof(*trialmask), - GFP_KERNEL); + trialmask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), + sizeof(*trialmask), GFP_KERNEL); if (trialmask == NULL) return -ENOMEM; if (!indio_dev->masklength) {