From: Chris Mi <cmi@nvidia.com>
Date: Mon, 5 Dec 2022 09:22:50 +0800
Subject: net/mlx5e: Always clear dest encap in neigh-update-del
Patch-mainline: v6.2-rc3
Git-commit: 2951b2e142ecf6e0115df785ba91e91b6da74602
References: jsc#PED-1549

The cited commit introduced a bug for multiple encapsulations flow.
If one dest encap becomes invalid, the flow is set slow path flag.
But when other dests encap become invalid, they are not cleared due
to slow path flag of the flow. When neigh-update-add is running, it
will use invalid encap.

Fix it by checking slow path flag after clearing dest encap.

Fixes: 9a5f9cc794e1 ("net/mlx5e: Fix possible use-after-free deleting fdb rule")
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
@@ -222,7 +222,7 @@ void mlx5e_tc_encap_flows_del(struct mlx
 	int err;
 
 	list_for_each_entry(flow, flow_list, tmp_list) {
-		if (!mlx5e_is_offloaded_flow(flow) || flow_flag_test(flow, SLOW))
+		if (!mlx5e_is_offloaded_flow(flow))
 			continue;
 
 		attr = mlx5e_tc_get_encap_attr(flow);
@@ -231,6 +231,13 @@ void mlx5e_tc_encap_flows_del(struct mlx
 		esw_attr->dests[flow->tmp_entry_index].flags &= ~MLX5_ESW_DEST_ENCAP_VALID;
 		esw_attr->dests[flow->tmp_entry_index].pkt_reformat = NULL;
 
+		/* Clear pkt_reformat before checking slow path flag. Because
+		 * in next iteration, the same flow is already set slow path
+		 * flag, but still need to clear the pkt_reformat.
+		 */
+		if (flow_flag_test(flow, SLOW))
+			continue;
+
 		/* update from encap rule to slow path rule */
 		spec = &flow->attr->parse_attr->spec;
 		rule = mlx5e_tc_offload_to_slow_path(esw, flow, spec);