In mlx5_pps_event(), several critical issues were identified: 1. The 'pin' index from the hardware event was used without bounds checking to index 'pin_config' and 'pps_info->start'. Check against MAX_PIN_NUM to prevent out-of-bounds access. 2. 'ptp_event' was not zero-initialized, potentially leaking stack memory through the union. 3. A NULL 'pin_config' could be dereferenced if initialization failed. 4. 'clock->ptp' could be NULL if ptp_clock_register() failed. Fixes: 7c39afb394c7 ("net/mlx5: PTP code migration to driver core section") Suggested-by: Carolina Jubran Signed-off-by: Prathamesh Deshpande --- v4: - Validate pin index against MAX_PIN_NUM instead of n_pins [Carolina]. v3: - Fix union corruption by using a local timestamp variable [Sashiko]. - Validate pin index against n_pins with WARN_ON_ONCE [Carolina]. - Remove redundant pin < 0 check and cleanup TODO comment. v2: - Zero-initialize ptp_event to prevent stack information leak [Sashiko]. - Add bounds check for hardware pin index to prevent OOB access [Sashiko]. - Add NULL guard for pin_config to handle initialization failures [Sashiko]. - Add NULL check for clock->ptp as originally intended. .../net/ethernet/mellanox/mlx5/core/lib/clock.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c index bd4e042077af..ff03dfa12a67 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c @@ -1164,16 +1164,22 @@ static int mlx5_pps_event(struct notifier_block *nb, pps_nb); struct mlx5_core_dev *mdev = clock_state->mdev; struct mlx5_clock *clock = mdev->clock; - struct ptp_clock_event ptp_event; + struct ptp_clock_event ptp_event = {}; struct mlx5_eqe *eqe = data; int pin = eqe->data.pps.pin; unsigned long flags; u64 ns; + if (!clock->ptp_info.pin_config) + return NOTIFY_OK; + + if (WARN_ON_ONCE(pin >= MAX_PIN_NUM)) + return NOTIFY_OK; + switch (clock->ptp_info.pin_config[pin].func) { case PTP_PF_EXTTS: ptp_event.index = pin; - ptp_event.timestamp = mlx5_real_time_mode(mdev) ? + ns = mlx5_real_time_mode(mdev) ? mlx5_real_time_cyc2time(clock, be64_to_cpu(eqe->data.pps.time_stamp)) : mlx5_timecounter_cyc2time(clock, @@ -1181,12 +1187,13 @@ static int mlx5_pps_event(struct notifier_block *nb, if (clock->pps_info.enabled) { ptp_event.type = PTP_CLOCK_PPSUSR; ptp_event.pps_times.ts_real = - ns_to_timespec64(ptp_event.timestamp); + ns_to_timespec64(ns); } else { ptp_event.type = PTP_CLOCK_EXTTS; + ptp_event.timestamp = ns; } - /* TODOL clock->ptp can be NULL if ptp_clock_register fails */ - ptp_clock_event(clock->ptp, &ptp_event); + if (clock->ptp) + ptp_clock_event(clock->ptp, &ptp_event); break; case PTP_PF_PEROUT: if (clock->shared) { -- 2.43.0