On 2/19/2021 11:57 AM, Dan Carpenter wrote:
The value of "sec" comes from the user. Negative values will lead to
shift wrapping inside the perout_conf_real_time() function and triggger
a UBSan warning.
Add a check and return -EINVAL to prevent that from happening.
Fixes: 432119de33d9 ("net/mlx5: Add cyc2time HW translation mode support")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
Saeed, I think this goes through your git tree and you will send a pull
request to the networking?
From static analysis. Not tested.
drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index b0e129d0f6d8..286824ca62b5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -516,7 +516,7 @@ static int mlx5_perout_configure(struct ptp_clock_info *ptp,
nsec = rq->perout.start.nsec;
sec = rq->perout.start.sec;
- if (rt_mode && sec > U32_MAX)
This if clause was set to reject perout time start sec bigger than
U32_MAX, as rt mode specifically doesn't support it.
A user negative values protection should be generic for all netdev
drivers, inside the caller ioctl func, and not part of any driver code.
+ if (rt_mode && (sec < 0 || sec > U32_MAX))
return -EINVAL;
time_stamp = rt_mode ? perout_conf_real_time(sec, nsec) :
