This is a note to let you know that I've just added the patch titled
ptp: fix integer overflow in max_vclocks_store
to the 6.6-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:
ptp-fix-integer-overflow-in-max_vclocks_store.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b86c46df18bbeb2c901cd7a177cd39fd63929ffe
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Mon Jun 17 12:34:32 2024 +0300
ptp: fix integer overflow in max_vclocks_store
[ 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>
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index 34ea5c16123a1..aefc06ae5d099 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -294,8 +294,7 @@ 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;
