From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit dd4c1b7d0c95be1c9245118a3accc41a16f1db67 ]
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@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.12+
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/md/dm-stats.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 87f86c7..6f2a4ce 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -795,6 +795,8 @@ 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++;
--
2.1.0
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