linux-kernel - Re: [PATCH] wifi: mt76: connac: check for null before dereferencing

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Message-ID: <ab6b08c5-86a2-47e3-8683-28cdbe5be7cf@collabora.com>
Date: Mon, 11 Mar 2024 22:11:51 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Felix Fietkau <nbd@....name>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Ryder Lee <ryder.lee@...iatek.com>, Shayne Chen <shayne.chen@...iatek.com>,
 Sean Wang <sean.wang@...iatek.com>, Kalle Valo <kvalo@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, kernel@...labora.com,
 kernel-janitors@...r.kernel.org, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] wifi: mt76: connac: check for null before dereferencing

Soft reminder

On 3/1/24 7:44 PM, Muhammad Usama Anjum wrote:
> The wcid can be NULL. It should be checked for validity before
> dereferencing it to avoid crash.
> 
> Fixes: 098428c400ff ("wifi: mt76: connac: set correct muar_idx for mt799x chipsets")
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> index af0c2b2aacb00..7af60eebe517a 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> @@ -283,7 +283,7 @@ __mt76_connac_mcu_alloc_sta_req(struct mt76_dev *dev, struct mt76_vif *mvif,
>  	};
>  	struct sk_buff *skb;
>  
> -	if (is_mt799x(dev) && !wcid->sta)
> +	if (is_mt799x(dev) && wcid && !wcid->sta)
>  		hdr.muar_idx = 0xe;
>  
>  	mt76_connac_mcu_get_wlan_idx(dev, wcid, &hdr.wlan_idx_lo,

-- 
BR,
Muhammad Usama Anjum