netdev - Re: [PATCH net v2] net: ethernet: mtk_eth_soc: fix NULL pointer on hw reset

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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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