From: Sebastian Roland Wolf Add a null pointer check to prevent kernel crashes when hardware offloading is active on MediaTek devices. In some edge cases, the ethernet pointer or its associated netdev element can be NULL. Checking these pointers before access is mandatory to avoid segmentation faults and kernel oops. This improves the robustness of the validation check for mtk_eth ingress devices introduced in commit 73cfd947dbdb ("net: mediatek: add support for ingress traffic offloading"). Fixes: 73cfd947dbdb ("net: mediatek: add support for ingress traffic offloading") net: mediatek: Add null pointer check to prevent crashes with active hardware offloading. Signed-off-by: Sebastian Roland Wolf --- drivers/net/ethernet/mediatek/mtk_ppe_offload.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c index e9bd32741983..6900ac87e1e9 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c @@ -270,7 +270,8 @@ mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f, flow_rule_match_meta(rule, &match); if (mtk_is_netsys_v2_or_greater(eth)) { idev = __dev_get_by_index(&init_net, match.key->ingress_ifindex); - if (idev && idev->netdev_ops == eth->netdev[0]->netdev_ops) { + if (idev && eth && eth->netdev[0] && + idev->netdev_ops == eth->netdev[0]->netdev_ops) { struct mtk_mac *mac = netdev_priv(idev); if (WARN_ON(mac->ppe_idx >= eth->soc->ppe_num)) -- 2.51.0