patch "iio: Fix scan mask selection" added to staging-linus

This is a note to let you know that I've just added the patch titled

iio: Fix scan mask selection

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 20ea39ef9f2f911bd01c69519e7d69cfec79fde3 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <[email protected]>
Date: Wed, 20 Feb 2019 17:11:32 +0200
Subject: 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.

Fixes commit 057ac1acdfc4 ("iio: Use kmalloc_array() in iio_scan_mask_set()").

---
 drivers/iio/industrialio-buffer.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

index cd5bfe39591b..dadd921a4a30 100644
@@ -320,9 +320,8 @@ static 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) {

2.21.0