net/mlx5e: Verify inline header size do not exceed SKB linear size

[ Upstream commit f600c6088018d1dbc5777d18daa83660f7ea4a64 ]

Driver tries to copy at least MLX5E_MIN_INLINE bytes into the control
segment of the WQE. It assumes that the linear part contains at least
MLX5E_MIN_INLINE bytes, which can be wrong.

Cited commit verified that driver will not copy more bytes into the
inline header part that the actual size of the packet. Re-factor this
check to make sure we do not exceed the linear part as well.

This fix is aligned with the current driver's assumption that the entire
L2 will be present in the linear part of the SKB.

Fixes: 6aace17e64f4 ("net/mlx5e: Fix inline header size for small packets")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index 1d6925d4369afd39df702da0c77177aa3888a6f3..eea7f931cad373f90b2402ade9ce7678d7402920 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -155,7 +155,7 @@ static inline u16 mlx5e_calc_min_inline(enum mlx5_inline_modes mode,
        default:
                hlen = mlx5e_skb_l2_header_offset(skb);
        }
-       return min_t(u16, hlen, skb->len);
+       return min_t(u16, hlen, skb_headlen(skb));
 }
 
 static inline void mlx5e_tx_skb_pull_inline(unsigned char **skb_data,