[PATCH net] net/mlx5e: Fix NULL deref in PTP TX timestamp recovery warn

[Tariq Toukan <tariqt@nvidia.com>]

From: Carolina Jubran <cjubran@nvidia.com>

PTP SQs are allocated via mlx5e_ptp_alloc_txqsq(), which never sets
sq->channel. The excessive port timestamp delta recovery path
incorrectly used sq->channel->netdev for netdev_warn(), causing a NULL
pointer dereference. Use sq->netdev instead.

Fixes: 391dad2e686f ("net/mlx5e: Recover SQ on excessive PTP TX timestamp delta")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Alex Lazar <alazar@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
index 723f66a6bd63..2e1c3bb5a959 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
@@ -98,7 +98,7 @@ static void mlx5e_skb_cb_hwtstamp_tx(struct sk_buff *skb,
 		ptpsq->cq_stats->abort_abs_diff_ns += diff;
 		if (diff > (NSEC_PER_SEC >> 1) &&
 		    !test_and_set_bit(MLX5E_SQ_STATE_RECOVERING, &sq->state)) {
-			netdev_warn(sq->channel->netdev,
+			netdev_warn(sq->netdev,
 				    "PTP TX timestamp difference between CQE and port exceeds threshold: %lld ns, recovering SQ %u\n",
 				    (s64)diff, sq->sqn);
 			queue_work(sq->priv->wq, &ptpsq->report_unhealthy_work);

base-commit: 513444cc62e231a11c9b15ea88de0890da9b2b4f
-- 
2.44.0