[PATCH net] net: ethernet: mtk_ppe: fix possible NULL pointer dereference in mtk_flow_get_wdma_info

From: Lorenzo Bianconi <lorenzo@kernel.org>
To: netdev@vger.kernel.org
Cc: nbd@nbd.name, john@phrozen.org, sean.wang@mediatek.com,
	Mark-MC.Lee@mediatek.com, davem@davemloft.net,
	edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
	matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org,
	lorenzo.bianconi@redhat.com
Subject: [PATCH net] net: ethernet: mtk_ppe: fix possible NULL pointer dereference in mtk_flow_get_wdma_info
Date: Mon, 18 Jul 2022 11:51:53 +0200	[thread overview]
Message-ID: <4e1685bc4976e21e364055f6bee86261f8f9ee93.1658137753.git.lorenzo@kernel.org> (raw)

odev pointer can be NULL in mtk_flow_offload_replace routine according
to the flower action rules. Fix possible NULL pointer dereference in
mtk_flow_get_wdma_info.

Fixes: a333215e10cb5 ("net: ethernet: mtk_eth_soc: implement flow offloading to WED devices")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/mediatek/mtk_ppe_offload.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 90e7dfd011c9..5d457bc9acc1 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -93,6 +93,9 @@ mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_i
 	};
 	struct net_device_path path = {};
 
+	if (!ctx.dev)
+		return -ENODEV;
+
 	memcpy(ctx.daddr, addr, sizeof(ctx.daddr));
 
 	if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED))
-- 
2.36.1

