Patch "dm stats: fix divide by zero if 'number_of_areas' arg is zero" has been added to the 4.1-stable tree

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

dm stats: fix divide by zero if 'number_of_areas' arg is zero

to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dm-stats-fix-divide-by-zero-if-number_of_areas-arg-is-zero.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mikulas Patocka <[email protected]>
Date: Fri, 5 Jun 2015 09:50:42 -0400
Subject: dm stats: fix divide by zero if 'number_of_areas' arg is zero

From: Mikulas Patocka <[email protected]>

commit dd4c1b7d0c95be1c9245118a3accc41a16f1db67 upstream.

If the number_of_areas argument was zero the kernel would crash on div-by-zero. Add better input validation.

---
 drivers/md/dm-stats.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -795,6 +795,8 @@ static int message_stats_create(struct m
 		return -EINVAL;
 
 	if (sscanf(argv[2], "/%u%c", &divisor, &dummy) == 1) {
+		if (!divisor)
+			return -EINVAL;
 		step = end - start;
 		if (do_div(step, divisor))
 			step++;

Patches currently in stable-queue which might be from [email protected] are

queue-4.1/dm-stats-fix-divide-by-zero-if-number_of_areas-arg-is-zero.patch queue-4.1/libata-increase-the-timeout-when-setting-transfer-mode.patch