target/linux/generic/backport-6.1/750-v6.5-15-net-ethernet-mtk_eth_soc-fix-NULL-pointer-on-hw-rese.patch

   1 From 3b12f42772c26869d60398c1710aa27b27cd945c Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Mon, 21 Aug 2023 17:12:44 +0100
   4 Subject: [PATCH 109/250] net: ethernet: mtk_eth_soc: fix NULL pointer on hw
   5  reset
   6
   7 When a hardware reset is triggered on devices not initializing WED the
   8 calls to mtk_wed_fe_reset and mtk_wed_fe_reset_complete dereference a
   9 pointer on uninitialized stack memory.
  10 Break out of both functions in case a hw_list entry is 0.
  11
  12 Fixes: 08a764a7c51b ("net: ethernet: mtk_wed: add reset/reset_complete callbacks")
  13 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  14 Reviewed-by: Simon Horman <horms@kernel.org>
  15 Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
  16 Link: https://lore.kernel.org/r/5465c1609b464cc7407ae1530c40821dcdf9d3e6.1692634266.git.daniel@makrotopia.org
  17 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  18 ---
  19  drivers/net/ethernet/mediatek/mtk_wed.c | 12 ++++++++++--
  20  1 file changed, 10 insertions(+), 2 deletions(-)
  21
  22 --- a/drivers/net/ethernet/mediatek/mtk_wed.c
  23 +++ b/drivers/net/ethernet/mediatek/mtk_wed.c
  24 @@ -214,9 +214,13 @@ void mtk_wed_fe_reset(void)
  25
  26         for (i = 0; i < ARRAY_SIZE(hw_list); i++) {
  27                 struct mtk_wed_hw *hw = hw_list[i];
  28 -               struct mtk_wed_device *dev = hw->wed_dev;
  29 +               struct mtk_wed_device *dev;
  30                 int err;
  31
  32 +               if (!hw)
  33 +                       break;
  34 +
  35 +               dev = hw->wed_dev;
  36                 if (!dev || !dev->wlan.reset)
  37                         continue;
  38
  39 @@ -237,8 +241,12 @@ void mtk_wed_fe_reset_complete(void)
  40
  41         for (i = 0; i < ARRAY_SIZE(hw_list); i++) {
  42                 struct mtk_wed_hw *hw = hw_list[i];
  43 -               struct mtk_wed_device *dev = hw->wed_dev;
  44 +               struct mtk_wed_device *dev;
  45 +
  46 +               if (!hw)
  47 +                       break;
  48
  49 +               dev = hw->wed_dev;
  50                 if (!dev || !dev->wlan.reset_complete)
  51                         continue;
  52