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dm stats: fix divide by zero if 'number_of_areas' arg is zero
author
Mikulas Patocka
<mpatocka@redhat.com>
Fri, 5 Jun 2015 13:50:42 +0000
(09:50 -0400)
committer
Mike Snitzer
<snitzer@redhat.com>
Wed, 17 Jun 2015 16:40:39 +0000
(12:40 -0400)
If the number_of_areas argument was zero the kernel would crash on
div-by-zero. Add better input validation.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.12+
drivers/md/dm-stats.c
patch
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diff --git
a/drivers/md/dm-stats.c
b/drivers/md/dm-stats.c
index
492fe6a
..
d1fd31a
100644
(file)
--- a/
drivers/md/dm-stats.c
+++ b/
drivers/md/dm-stats.c
@@
-792,6
+792,8
@@
static int message_stats_create(struct mapped_device *md,
return -EINVAL;
if (sscanf(argv[2], "/%u%c", &divisor, &dummy) == 1) {
+ if (!divisor)
+ return -EINVAL;
step = end - start;
if (do_div(step, divisor))
step++;