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authorMikulas Patocka <mpatocka@redhat.com>2015-06-05 09:50:42 -0400
committerMike Snitzer <snitzer@redhat.com>2015-06-17 12:40:39 -0400
commitdd4c1b7d0c95be1c9245118a3accc41a16f1db67 (patch)
tree3f2ba6693d124977cd18155d132f52a1de20c9b2 /drivers/md
parentbccab6a01afc26f53d91762d78153513cad10b29 (diff)
dm stats: fix divide by zero if 'number_of_areas' arg is zero
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+
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-stats.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 492fe6a5ebf2..d1fd31a6dd1a 100644
--- 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++;