[PATCH nf-next,v5 3/6] net: dsa: stop at the user device in .fill_forward_path

The flowtable path discovery stops at the DSA user device when setting
up the forward path. Let's just report there is no more devices after
the DSA user port through the .fill_forward_path interface.

No functional changes are intended.

Signed-off-by: Pablo Neira Ayuso <[email protected]>
---
v5: new in this series. This is a cleanup so flowtable path discovery
    does not need to break at the user DSA device, skipping remaining
    ones; sashiko reports a hypothetical dst leak otherwise.

 net/dsa/user.c                     | 3 +--
 net/netfilter/nf_flow_table_path.c | 7 ++-----
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/net/dsa/user.c b/net/dsa/user.c
index 03c7af6abe18..4065c6ee6fc6 100644
--- a/net/dsa/user.c
+++ b/net/dsa/user.c
@@ -2547,14 +2547,13 @@ static int dsa_user_fill_forward_path(struct net_device_path_ctx *ctx,
 				      struct net_device_path *path)
 {
 	struct dsa_port *dp = dsa_user_to_port(ctx->dev);
-	struct net_device *conduit = dsa_port_to_conduit(dp);
 	struct dsa_port *cpu_dp = dp->cpu_dp;
 
 	path->dev = ctx->dev;
 	path->type = DEV_PATH_DSA;
 	path->dsa.proto = cpu_dp->tag_ops->proto;
 	path->dsa.port = dp->index;
-	ctx->dev = conduit;
+	ctx->dev = NULL;
 
 	return 0;
 }
diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c
index 8f04a4487897..004dc75ac357 100644
--- a/net/netfilter/nf_flow_table_path.c
+++ b/net/netfilter/nf_flow_table_path.c
@@ -114,12 +114,9 @@ static int nft_dev_path_info(const struct net_device_path_stack *stack,
 			if (is_zero_ether_addr(info->h_source))
 				memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
 
-			if (path->type == DEV_PATH_ETHERNET)
+			if (path->type == DEV_PATH_ETHERNET ||
+			    path->type == DEV_PATH_DSA)
 				break;
-			if (path->type == DEV_PATH_DSA) {
-				i = stack->num_paths;
-				break;
-			}
 
 			/* DEV_PATH_VLAN, DEV_PATH_PPPOE and DEV_PATH_TUN */
 			if (path->type == DEV_PATH_TUN) {
-- 
2.47.3