From 3b12f42772c26869d60398c1710aa27b27cd945c Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Mon, 21 Aug 2023 17:12:44 +0100 Subject: [PATCH 109/250] net: ethernet: mtk_eth_soc: fix NULL pointer on hw reset When a hardware reset is triggered on devices not initializing WED the calls to mtk_wed_fe_reset and mtk_wed_fe_reset_complete dereference a pointer on uninitialized stack memory. Break out of both functions in case a hw_list entry is 0. Fixes: 08a764a7c51b ("net: ethernet: mtk_wed: add reset/reset_complete callbacks") Signed-off-by: Daniel Golle Reviewed-by: Simon Horman Acked-by: Lorenzo Bianconi Link: https://lore.kernel.org/r/5465c1609b464cc7407ae1530c40821dcdf9d3e6.1692634266.git.daniel@makrotopia.org Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/mediatek/mtk_wed.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/drivers/net/ethernet/mediatek/mtk_wed.c +++ b/drivers/net/ethernet/mediatek/mtk_wed.c @@ -214,9 +214,13 @@ void mtk_wed_fe_reset(void) for (i = 0; i < ARRAY_SIZE(hw_list); i++) { struct mtk_wed_hw *hw = hw_list[i]; - struct mtk_wed_device *dev = hw->wed_dev; + struct mtk_wed_device *dev; int err; + if (!hw) + break; + + dev = hw->wed_dev; if (!dev || !dev->wlan.reset) continue; @@ -237,8 +241,12 @@ void mtk_wed_fe_reset_complete(void) for (i = 0; i < ARRAY_SIZE(hw_list); i++) { struct mtk_wed_hw *hw = hw_list[i]; - struct mtk_wed_device *dev = hw->wed_dev; + struct mtk_wed_device *dev; + + if (!hw) + break; + dev = hw->wed_dev; if (!dev || !dev->wlan.reset_complete) continue;