From e409c23c2d0630f3b95efd12428b2e58800b7645 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 18 Jun 2026 08:25:47 +0200 Subject: [PATCH] netfilter: nft_flow_offload: zero device address for non-ether case LLM points out that the skip causes unitialised stack array to propagate down into dev_fill_forward_path(). Its not clear to me that there is a guarantee that a later ctx.dev->netdev_ops->ndo_fill_forward_path() would always fix this up. Cc: Felix Fietkau Fixes: 45ca3e61999e ("netfilter: nft_flow_offload: skip dst neigh lookup for ppp devices") Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_flow_table_path.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c index 1e7e216b9f89..98c03b487f52 100644 --- a/net/netfilter/nf_flow_table_path.c +++ b/net/netfilter/nf_flow_table_path.c @@ -53,8 +53,10 @@ static int nft_dev_fill_forward_path(const struct nf_flow_route *route, struct neighbour *n; u8 nud_state; - if (!nft_is_valid_ether_device(dev)) + if (!nft_is_valid_ether_device(dev)) { + eth_zero_addr(ha); goto out; + } n = dst_neigh_lookup(dst_cache, daddr); if (!n)