linux-kernel - Re: [PATCH] brcm80211: Avoid possible null-pointer dereferences in wlc_phy_radio_init

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Date:   Tue,  3 Sep 2019 13:37:45 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     arend.vanspriel@...adcom.com, franky.lin@...adcom.com,
        hante.meuleman@...adcom.com, chi-hsien.lin@...ress.com,
        wright.feng@...ress.com, davem@...emloft.net,
        pieter-paul.giesberts@...adcom.com, plaes@...es.org,
        rvarsha016@...il.com, linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: Re: [PATCH] brcm80211: Avoid possible null-pointer dereferences in
 wlc_phy_radio_init_2056()

Jia-Ju Bai <baijiaju1990@...il.com> wrote:

> In wlc_phy_radio_init_2056(), regs_SYN_2056_ptr, regs_TX_2056_ptr and
> regs_RX_2056_ptr may be not assigned, and thus they are still NULL.
> Then, they are used on lines 20042-20050:
>     wlc_phy_init_radio_regs(pi, regs_SYN_2056_ptr, (u16) RADIO_2056_SYN);
> 	wlc_phy_init_radio_regs(pi, regs_TX_2056_ptr, (u16) RADIO_2056_TX0);
> 	wlc_phy_init_radio_regs(pi, regs_TX_2056_ptr, (u16) RADIO_2056_TX1);
> 	wlc_phy_init_radio_regs(pi, regs_RX_2056_ptr, (u16) RADIO_2056_RX0);
> 	wlc_phy_init_radio_regs(pi, regs_RX_2056_ptr, (u16) RADIO_2056_RX1);
> 
> Thus, possible null-pointer dereferences may occur.
> 
> To avoid these bugs, when these variables are not assigned,
> wlc_phy_radio_init_2056() directly returns.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

Patch applied to wireless-drivers-next.git, thanks.

b80df89f3909 brcm80211: Avoid possible null-pointer dereferences in wlc_phy_radio_init_2056()

-- 
https://patchwork.kernel.org/patch/11063553/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches