Patch "mlx5: fix skb leak while fifo resync and push" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    mlx5: fix skb leak while fifo resync and push

to the 6.2-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:
     mlx5-fix-skb-leak-while-fifo-resync-and-push.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit fca4095a8c41a80f94a7c81d16ac54a6d88f7f67
Author: Vadim Fedorenko <vadfed@xxxxxxxx>
Date:   Thu Feb 2 09:13:54 2023 -0800

    mlx5: fix skb leak while fifo resync and push
    
    [ Upstream commit e435941b1da1a0be4ff8a7ae425774c76a5ac514 ]
    
    During ptp resync operation SKBs were poped from the fifo but were never
    freed neither by napi_consume nor by dev_kfree_skb_any. Add call to
    napi_consume_skb to properly free SKBs.
    
    Another leak was happening because mlx5e_skb_fifo_has_room() had an error
    in the check. Comparing free running counters works well unless C promotes
    the types to something wider than the counter. In this case counters are
    u16 but the result of the substraction is promouted to int and it causes
    wrong result (negative value) of the check when producer have already
    overlapped but consumer haven't yet. Explicit cast to u16 fixes the issue.
    
    Fixes: 58a518948f60 ("net/mlx5e: Add resiliency for PTP TX port timestamp")
    Reviewed-by: Gal Pressman <gal@xxxxxxxxxx>
    Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxx>
    Signed-off-by: Vadim Fedorenko <vadfed@xxxxxxxx>
    Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
index 8469e9c386706..b72de2b520ecb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
@@ -86,7 +86,8 @@ static bool mlx5e_ptp_ts_cqe_drop(struct mlx5e_ptpsq *ptpsq, u16 skb_cc, u16 skb
 	return (ptpsq->ts_cqe_ctr_mask && (skb_cc != skb_id));
 }
 
-static void mlx5e_ptp_skb_fifo_ts_cqe_resync(struct mlx5e_ptpsq *ptpsq, u16 skb_cc, u16 skb_id)
+static void mlx5e_ptp_skb_fifo_ts_cqe_resync(struct mlx5e_ptpsq *ptpsq, u16 skb_cc,
+					     u16 skb_id, int budget)
 {
 	struct skb_shared_hwtstamps hwts = {};
 	struct sk_buff *skb;
@@ -98,6 +99,7 @@ static void mlx5e_ptp_skb_fifo_ts_cqe_resync(struct mlx5e_ptpsq *ptpsq, u16 skb_
 		hwts.hwtstamp = mlx5e_skb_cb_get_hwts(skb)->cqe_hwtstamp;
 		skb_tstamp_tx(skb, &hwts);
 		ptpsq->cq_stats->resync_cqe++;
+		napi_consume_skb(skb, budget);
 		skb_cc = PTP_WQE_CTR2IDX(ptpsq->skb_fifo_cc);
 	}
 }
@@ -119,7 +121,7 @@ static void mlx5e_ptp_handle_ts_cqe(struct mlx5e_ptpsq *ptpsq,
 	}
 
 	if (mlx5e_ptp_ts_cqe_drop(ptpsq, skb_cc, skb_id))
-		mlx5e_ptp_skb_fifo_ts_cqe_resync(ptpsq, skb_cc, skb_id);
+		mlx5e_ptp_skb_fifo_ts_cqe_resync(ptpsq, skb_cc, skb_id, budget);
 
 	skb = mlx5e_skb_fifo_pop(&ptpsq->skb_fifo);
 	hwtstamp = mlx5e_cqe_ts_to_ns(sq->ptp_cyc2time, sq->clock, get_cqe_ts(cqe));
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index 853f312cd7572..15a5a57b47b85 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -81,7 +81,7 @@ void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq);
 static inline bool
 mlx5e_skb_fifo_has_room(struct mlx5e_skb_fifo *fifo)
 {
-	return (*fifo->pc - *fifo->cc) < fifo->mask;
+	return (u16)(*fifo->pc - *fifo->cc) < fifo->mask;
 }
 
 static inline bool



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