target/linux/generic/backport-5.15/711-v6.0-02-net-ethernet-mtk_ppe-fix-possible-NULL-pointer-deref.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Mon, 18 Jul 2022 11:51:53 +0200
   3 Subject: [PATCH] net: ethernet: mtk_ppe: fix possible NULL pointer dereference
   4  in mtk_flow_get_wdma_info
   5
   6 odev pointer can be NULL in mtk_flow_offload_replace routine according
   7 to the flower action rules. Fix possible NULL pointer dereference in
   8 mtk_flow_get_wdma_info.
   9
  10 Fixes: a333215e10cb5 ("net: ethernet: mtk_eth_soc: implement flow offloading to WED devices")
  11 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  12 Link: https://lore.kernel.org/r/4e1685bc4976e21e364055f6bee86261f8f9ee93.1658137753.git.lorenzo@kernel.org
  13 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  14 ---
  15
  16 --- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
  17 +++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
  18 @@ -93,6 +93,9 @@ mtk_flow_get_wdma_info(struct net_device
  19         };
  20         struct net_device_path path = {};
  21
  22 +       if (!ctx.dev)
  23 +               return -ENODEV;
  24 +
  25         memcpy(ctx.daddr, addr, sizeof(ctx.daddr));
  26
  27         if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED))