6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ Upstream commit 81d23d2a24012e448f651e007fac2cfd20a45ce0 ]
On 32bit systems, the "4 * max" multiply can overflow. Use kcalloc()
to do the allocation to prevent this.
Fixes: 44c494c8e30e ("ptp: track available ptp vclocks information")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxx>
Reviewed-by: Heng Qi <hengqi@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/ee8110ed-6619-4bd7-9024-28c1f2ac24f4@moroto.mountain
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/ptp/ptp_sysfs.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index 74b9c794d6363..1263612ef2759 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -283,8 +283,7 @@ static ssize_t max_vclocks_store(struct device *dev,
if (max < ptp->n_vclocks)
goto out;
- size = sizeof(int) * max;
- vclock_index = kzalloc(size, GFP_KERNEL);
+ vclock_index = kcalloc(max, sizeof(int), GFP_KERNEL);
if (!vclock_index) {
err = -ENOMEM;
goto out;
--
2.43.0
