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

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Date: Thu, 4 Apr 2024 16:49:59 +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 3/11/24 10:11 PM, Muhammad Usama Anjum wrote:
> 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