[PATCH] mt76: mt7925: main.c: Avoid possible NULL Pointer Dereference in mt7925_change_vif_links()

[Krzysztof Kozlowski]

On 30/09/2024 20:51, Gax-c wrote:
> 'mconf = devm_kzalloc()' and 'mlink = devm_kzalloc()' may return NULL.
> NULL Pointer Dereference may be triggered in the statement 'mconf->link_id = link_id;' below.
> Add a null check for the returned pointer.
> 
> Fixes: 69acd6d910b0 ("wifi: mt76: mt7925: add mt7925_change_vif_links")
> Signed-off-by: Zichen Xie <zichenxie0106 at gmail.com>
> Reported-by: Zichen Xie <zichenxie0106 at gmail.com>
> Reported-by: Zijie Zhao <zzjas98 at gmail.com>
> Reported-by: Chenyuan Yang <chenyuan0y at gmail.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt7925/main.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/main.c b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
> index 791c8b00e112..ea635169497f 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7925/main.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
> @@ -1948,6 +1948,12 @@ mt7925_change_vif_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
>  					     GFP_KERNEL);
>  		}
>  
> +		if (!mconf || !mlink) {
> +			err = -ENOMEM;
> +			goto free;
> +		}
> +

All previous comments apply - wrapping, commit tags, unnecessary blank
lines, proper cleanup.

Best regards,
Krzysztof