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Message-ID: <ZOORL5HSSSRUxHmQ@lore-desk>
Date: Mon, 21 Aug 2023 18:30:39 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
Sean Wang <sean.wang@...iatek.com>,
Mark Lee <Mark-MC.Lee@...iatek.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Sujuan Chen <sujuan.chen@...iatek.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v2] 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 <daniel@...rotopia.org>
Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Reviewed-by: Simon Horman <horms@...nel.org>
> ---
> Changes since v1:
> * remove unneeded {} initialization for stack allocated memory
>
> drivers/net/ethernet/mediatek/mtk_wed.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
> index 00aeee0d5e45f..94376aa2b34c5 100644
> --- a/drivers/net/ethernet/mediatek/mtk_wed.c
> +++ b/drivers/net/ethernet/mediatek/mtk_wed.c
> @@ -222,9 +222,13 @@ 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;
>
> @@ -245,8 +249,12 @@ 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;
>
> --
> 2.41.0
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