target/linux/generic/backport-5.15/730-16-v6.3-net-ethernet-mtk_wed-fix-some-possible-NULL-pointer-.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Wed, 7 Dec 2022 15:04:54 +0100
   3 Subject: [PATCH] net: ethernet: mtk_wed: fix some possible NULL pointer
   4  dereferences
   5
   6 Fix possible NULL pointer dereference in mtk_wed_detach routine checking
   7 wo pointer is properly allocated before running mtk_wed_wo_reset() and
   8 mtk_wed_wo_deinit().
   9 Even if it is just a theoretical issue at the moment check wo pointer is
  10 not NULL in mtk_wed_mcu_msg_update.
  11 Moreover, honor mtk_wed_mcu_send_msg return value in mtk_wed_wo_reset()
  12
  13 Fixes: 799684448e3e ("net: ethernet: mtk_wed: introduce wed wo support")
  14 Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
  15 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  16 Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
  17 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  18 ---
  19
  20 --- a/drivers/net/ethernet/mediatek/mtk_wed.c
  21 +++ b/drivers/net/ethernet/mediatek/mtk_wed.c
  22 @@ -174,9 +174,10 @@ mtk_wed_wo_reset(struct mtk_wed_device *
  23         mtk_wdma_tx_reset(dev);
  24         mtk_wed_reset(dev, MTK_WED_RESET_WED);
  25
  26 -       mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO,
  27 -                            MTK_WED_WO_CMD_CHANGE_STATE, &state,
  28 -                            sizeof(state), false);
  29 +       if (mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO,
  30 +                                MTK_WED_WO_CMD_CHANGE_STATE, &state,
  31 +                                sizeof(state), false))
  32 +               return;
  33
  34         if (readx_poll_timeout(mtk_wed_wo_read_status, dev, val,
  35                                val == MTK_WED_WOIF_DISABLE_DONE,
  36 @@ -632,9 +633,11 @@ mtk_wed_detach(struct mtk_wed_device *de
  37         mtk_wed_free_tx_rings(dev);
  38
  39         if (mtk_wed_get_rx_capa(dev)) {
  40 -               mtk_wed_wo_reset(dev);
  41 +               if (hw->wed_wo)
  42 +                       mtk_wed_wo_reset(dev);
  43                 mtk_wed_free_rx_rings(dev);
  44 -               mtk_wed_wo_deinit(hw);
  45 +               if (hw->wed_wo)
  46 +                       mtk_wed_wo_deinit(hw);
  47         }
  48
  49         if (dev->wlan.bus_type == MTK_WED_BUS_PCIE) {
  50 --- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
  51 +++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
  52 @@ -207,6 +207,9 @@ int mtk_wed_mcu_msg_update(struct mtk_we
  53         if (dev->hw->version == 1)
  54                 return 0;
  55
  56 +       if (WARN_ON(!wo))
  57 +               return -ENODEV;
  58 +
  59         return mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO, id, data, len,
  60                                     true);
  61  }